___ NO3-(aq) + ___ Cu(s) → ___ NO(g) + ___ Cu2+(aq)? (Six electrons would be lost by three arsenic atoms.) In almost all cases, oxygen atoms have oxidation numbers of -2. Answer:. Step 3: The oxidation number of copper has increased from 0 to +2 while that of nitrogen has decreased from +5 to +4. How do you balance the following redox reaction? #"KMnO"_4 + "Na"_2"C"_2"O"_4 + "H"_2"SO"_4 → "K"_2"SO"_4 + "Na"_2"SO"_4 + "MnSO"_4 + "CO"_2 + "H"_2"O"#. #"KMnO"_4 + "H"_2"O"_2 + "H"_2"SO"_4 -> "MnSO"_4 + "K"_2"SO"_4 + "O"_2 + "H"_2"O"# ? Now try to balance the equations in the link below (answers included). 1. What is the difference between the oxidation number method and the half-reaction method? In order to learn how to find the oxidation number of an atom in a given compound, it is important to learn what oxidation numbers are. Be sure to check that the atoms and the charge are balanced. How do you balance this redox reaction using the oxidation number method? Will methylated spirit dissolve iodine? Can you represent the reduction of tellurite ion, #TeO_3^(2-)#, to tellurium metal by the oxidation of iodide ion? Here's how the oxidation number method works for a very simple equation that you could probably balance in your head. Balance this reaction? 2HNO₃ + 3H₃AsO₃(aq) → 2NO(g) + 3H₃AsO₄(aq) + H₂O(l). In the half-reaction method, you determine the oxidation numbers and write two half-reactions. It's just one process and one method with variations. How does lead sulfide react with oxygen gas to form #PbO#, and #SO_2#? How do you balance the redox reaction? What are the coefficients in front of NO3-(aq) and Cu(s) when the following redox equation is balanced in an acidic solution: Any free element has an oxidation number equal to zero. 3MnO4²- + 4H+→ MnO2+2MnO4- + 2H2O is? How do we represent #(i)# represent the reduction of #"chlorate ion"#, #ClO_3^(-)#, to give #ClO_2#? How do you balance redox reactions in basic solution? How do you represent the redox reaction of chlorate ion, #ClO_3^(-)# with #SO_2(g)# to give #Cl^(-)# and #SO_4^(2-)#? What is the redox equation for the oxidation of potassium chloride to chlorine gas by potassium permanganate in the presence of sulfuric acid? Please help me, thanks. Is it necessary to break the equation into half reactions in the oxidation number method? Given that the sulfate(IV) ion, #SO_2^(-2)#, is converted to the sulfate(VI) ion, #SO_4^(-2)#, in the presence of water, deduce the balanced equation for the redox reaction between #Cr_2O_7^(-2)# (aq) and #SO_3^(-2)#? Balance the equation by oxidation number method. HNO 3 (aq) + H 3 AsO 3 (aq) - … Since there are two oxygen atoms in carbon dioxide, the total of the oxidation numbers corresponding to each oxygen is -4. Indicate the oxidation number of all the elements involved in the reaction. How do you balance this reaction? Identify the atoms that change oxidation number Redox Reactions. #"S" + "HNO"_3 -> "H"_2"SO"_4 + "NO"_2 + "H"_2"O"# ? but must be clear .. The similar procedure applies to the basic or neutral media. Below is a method of balancing using redox numbers that works for all reaction no matter how complex. Skeleton equation. The oxidation number of an atom is a number that represents the total number of electrons lost or gained by it. Step 1 Write the correct formulas for all the reactants and products : Step 2 Assign oxidation numbers to the atoms in the equation. What is the oxidation half reaction for #Fe(s) + 2HCl(aq) -> FeCl_2(aq) + H_2(g)#? Can you help me balance this equation? Method 2 requires a calculation on oxidation number where method 1 does not. All reactants and products must be known. The oxidation number of a Group 1 element in a compound is +1. What is the coefficient for #H^+# when the redox equation below is balanced? In this method, the equation is separated into two half-equations; one for oxidation and one for reduction. Step 3 Identify which atoms change their oxidation numbers. How do you balance disproportionation redox reactions? None of it will happen if you don't get the oxidation number of every player in the reaction. How do you balance #CO(g) + I_2O_5(s) -> I_2(s) + CO_2(g)#? Steps for balancing redox equations by oxidation number method. What are some examples of balancing redox equations using the oxidation number method? For a better result write the reaction in ionic form. The oxidation number method is a way of keeping track of electrons when balancing redox equations. Will it dissolve sodium chloride or potassium permanganate? An oxidation number can be assigned to a given element or compound by following the following rules. This gives us total changes of -6 and +6. There are a few exceptions to this rule: When oxygen is in its elemental state (O 2), its oxidation number is 0, as is the case for all elemental atoms. Fe2+(aq) + MnO4–(aq) --> Fe3+(aq) + Mn2+(aq), How do you balance this redox reaction using the oxidation number method? Balance the below in acidic solution (redox reaction)? The reduction is the gain of electrons whereas oxidationis the loss of electrons. Al(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2(g), How do you balance this redox reaction using the oxidation number method? Step 3. Steps to balance the redox equation using the oxidation number method: Ex: Permanganate ion reacts with bromide ion in basic medium to give Manganese dioxide and bromate ion. How does aluminum metal react with nitrate ion under basic conditions to give ammonia, and aluminum ion? Balance this redox reaction in acidic media? Balancing equations chemistry by oxidation number method for class 11 . HNO3(aq) + H3AsO3(aq) --> NO(g) + H3AsO4(aq) + H2O(l), How do you balance this redox reaction using the oxidation number method? How to use the oxidation number method to understand oxidation-reduction reactions. These values can be verified by adding these oxidation numbers. The alkali metals (group I) always have an oxidation number of +1. Balance the changes in oxidation numbers by multiplying by the appropriate coefficient. Determine the increase and decrease of oxidation number … When you solve that you get -1 as an answer for X, the oxidation number of oxygen for this compound. What is the difference between the oxidation number method and the ion-electron method? Each equation is balanced by adjusting coefficients and adding H 2 O, H + , and e - … In the case of the oxidation number method, an equation of the reaction is created by first identifying the reactants and the products. Ion-Electron Method (Half Reaction Method) Jette and LaMev developed the method for balancing redox-reactions by ion electron method in 1927. Any free element has an oxidation number equal to zero. Calculate the increase or decrease in oxidation number per atom. Why is the oxidation number method useful? In this video, we'll walk through this process for the reaction between dichromate (Cr₂O₇²⁻) and chloride (Cl⁻) ions in acidic solution. When balancing a redox reaction, what are you balancing? Can you represent the reduction of dinitrogen pentoxide by dihydrogen gas? As atoms would yield a net increase in oxidation number of +6. You need 2 atoms of #"H"# for every 1 atom of #"Zn"#. How do you solve #I^- + ClO^- rarr I_3^- +Cl# using the redox reaction method in a base solution? Each #"Zn"# atom has lost two electrons, and each #"H"# atom has gained one electron. Step 3. Identify the element or elements, which undergo a change in oxidation number, one whose oxidation number increases (reducing agent) and the other whose oxidation number decreases (oxidizing agent). How is #"thiosulfate anion"#, #S_2O_3^(2-)#, oxidized by #"permanganate anion"#, #MnO_4^(-)#? 1. How do we solve a redox equation when BASIC conditions are specified? Calculating Oxidation Numbers. In order to help students understand how to find oxidation number, the oxidation states of each individual atom in some example compounds are determined below. The total charge on HBrO 2 is zero. What is the balanced redox reaction between lead and ammonia? What is the Balanced redox reaction for the following equation: How do you balance #Cu + H_2SO_4 -> CuSO_4 + SO_2 + H_2O# and identify the element oxidized and the oxidizing agent? In this method, the equation is separated into two half-equations; one for oxidation and one for reduction. 2. #S_2O_(8(aq))^(2-) + Cr_((aq))^(3+) -> SO_(4(aq))^(2-) + Cr_2O_(7(aq))^(2-)#. Write the skeleton redox reaction. Solution Step 1. As atoms would yield a net increase in oxidation number of +6. Rules for assigning oxidation numbers. Convert the unbalanced redox reaction to the ionic form. Required fields are marked *, In order to learn how to find the oxidation number of an atom in a given compound, it is important to learn what oxidation numbers are. Then you balance the rest of the atoms. Each equation is balanced by adjusting coefficients and adding H 2 O, H +, and e - in this order: Balance elements in the equation other than O and H. Plan Your Strategy Act on Your Strategy Step 1 Assign an oxidation number to each atom in the equation and determine whether it is a redox reaction. (ii) Split the redox reaction into two half reactions, one for oxidation and other for reduction. Oxidation number method : Step-1: Identify atoms which undergo change in oxidation number in the reaction.. Step-2: Calculate the increase(↑) or decrease(↓) in the oxidation number per atom and multiply it by number of atoms undergoing that change, if increase or decrease is not equal then multiply by suitable number to make them equal. They are just different ways of keeping track of the electrons transferred during the reaction. Any free element has an oxidation number equal to zero. In both methods, you must know what the oxidation numbers are and what they become during the reaction. Place these numbers as coefficients in front of the formulas containing those atoms. Oxidation: Cu → Cu. So the oxidation-number increase should be multiplied by 3, while the oxidation-number … The alkali metals (group I) always have an oxidation number of +1. How is pyrophosphate anion, #P_2O_7^(4-)# reduced to elemental phosphorus, with oxidation of hydrogen sulfide to sulphur? For a certain reaction #2A + B rightleftharpoons C + 3D#, #K_(eq) = 4.2 xx 10^3#, which of the following is true? 2. Balance this reaction using ion electron method in shortest way possible . There are generally two methods for balancing redox reactions (chemical equations) in a redox process. Since the total is zero, which is the value of the oxidation number corresponding to a neutral molecule, the values are verified. However, when bonded with an element with less. When polyatomic ions are considered, the sum of all the oxidation numbers of the atoms that constitute them equals the net charge of the polyatomic ion. Step 2. We need 2 atoms of N for every 3 atoms of As. Balance the following redox equation using either the inspection technique or the oxidation number method. What redox reaction occurs between #MnO_2# and #HCl#? Left hand side: Zn = 0; H = +1; Cl = -1 Reduction: … In this case, the least common multiple of 2 and 3 is 6. The various steps involved in the balancing of redox equations according to this method are : 1. In the case of the oxidation number method, an equation of the reaction is created by first identifying the reactants and the products. How do you write a balanced equation for this redox reaction using the smallest whole number coefficients? 11th/Chemistry. How do you balance #Al(s) + S(s) -> Al_2S_3(s)#? Sometimes one method is more convenient than the other method. HNO₃ + H₃AsO₃(aq) → NO(g) + H₃AsO₄(aq) + H₂O(l), Identify the oxidation number of every atom. The hydrogen atom (H) exhibits an oxidation state of +1. What do we call the process when oxygen gas reacts with a SINGLE electron? How could sulfur be oxidized to #SO_3# by the action of #NO_3^(-)#? #"H"#: +1 → 0; Change = -1, Step 2. When using the half reaction method of balancing redox reactions, what should you do first? How do you balance #SO_3(g) -> SO_2(g) + O_2(g)#? Show, the increase/decrease of oxidation number. This gives us total changes of +2 and -2. How do we represent the oxidation of ethanol to acetic acid by potassium permanganate using the oxidation number method? The Wizard for Oxidation Number Method walks through step-by-step in balancing an equation with detailed guide side-by-side. How is #NO_2# oxidized by #Cr_2O_7^(2-)# to give nitrate ion? The only sure-fire way to balance a redox equation is to recognize the oxidation part and the reduction part. Fluorine in compounds is always assigned an oxidation number of -1. Since chlorine is more electronegative than hydrogen, an oxidation number of +1 can be assigned to the hydrogen atom in HCl. Determine the oxidation numbers of the species being oxidized and reduced (and make sure there are the same number of atoms on each side). We know that O has an oxidation number of -2 from Rule 7 and hydrogen is H (I) from Rule 6. Right hand side: N = +2; O = -2; H = +1; As = +5, Determine the change in oxidation number for each atom that changes. The similar procedure applies to the basic or neutral media. Half-Reaction Or ion-electron Method For Balancing Redox Reactions #Fe^(2+)+MnO_4^(-)+H^(+) -> Fe^(3+)+Mn^(2+)+H_2O# It involves the following steps (i) Write down the redox reaction in ionic form. The oxidation number of a monatomic ion equals the charge of the ion. The example shown below is for the reaction in acidic media. Writing oxidation numbers of each atom. When balancing equations for redox reactions occurring in acidic solution, it is often necessary to add H⁺ ions or the H⁺/H₂O pair to fully balance the equation. The oxidation number of a monatomic ion equals the charge of the ion. How would you balance the following reactions using the oxidation number change method? If we use the equation above to solve for the oxidation number … So, 2* (+1) + 2x = 0 As in 2 multiplied by the oxidation number of H, that is +1 added to 2 into X, (X stands for oxygen) equals to zero. #"Zn"#: 0 → +2; Change = +2 (Six electrons would be lost by three arsenic atoms.) Determine the increase and decrease of oxidation number … Then you add the two half reactions together and balance the rest of the atoms. A) 2, 6 B) 3, 6 C) 3, 4 D) 2, 3. (i) Write down the correct formula of all the reactants and products in the reaction. The steps to be followed are : (i) Write the equation (if it is not complete, then complete it) representing the chemical changes. How do you balance #K+B_2O_3 -> K_2O + B#? 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You are given rules for assigning oxidation numbers in Table 9.3 on page 604 of the student textbook. Step 4: Make electron gain equivalent to electron loss in the half-reactions How do you use the half-equation to represent oxidation-reduction reactions? Right hand … Write skeleton equation and indicate oxidation number of each element and thus identify the elements undergoing change in oxidation number. When there is an increase in the oxidation number, oxidation occurs. Oxidation Number Method : This method is based on the principle that the number of electrons lost in oxidation must be equal to the number of electrons gained in reduction. Fluorine in compounds is always assigned an oxidation number of -1. How do represent the oxidation of chloride anion to chlorine in acidic solution? Make the total increase in oxidation number equal to the total decrease in oxidation number. The various steps involved in the balancing of redox equations according to this method are : 1. N2H4 + ClO3- → NO + Cl- Step 2. The Wizard for Oxidation Number Method walks through step-by-step in balancing an equation with detailed guide side-by-side. Step 5: Determine a ratio of oxidized to reduced atoms that would yield a net increase in oxidation number equal to the net decrease in oxidation number. Step 1. Is the reaction of #"lead sulfide"# with #"dioxygen gas"# to give #"lead oxide"#, and #"sulfur dioxide"#, a redox reaction? ? Open the Balance Equation module and enter the unbalanced equation. The oxidation number of a free element is always 0. The two methods are- Oxidation Number Method & Half-Reaction Method. As per the rules discussed above, the oxidation state of a group 17 element (halogen) in a diatomic molecule is -1. The oxidation number of an atom is a number that represents the total number of electrons lost or gained by it. How to I write half reactions and balance this oxidation-reduction reaction? When assigning oxidation numbers for molecules use the following equation: For instance take HBrO 2. How do we represent the oxidation of hydrogen sulfide by nitric acid to give sulfur and #NO(g)#? scientific method hypothesis theory conclusion research. How do you balance redox equations in acidic solutions? And we know that the oxidation number of H is +1. All alkali metals (group 1 elements) have an oxidation state of +1 in their compounds. Be sure to check that the atoms and the charge are balanced. As discussed, it is very important to understand “balancing redox reactions”. oxidation number method oxidation states. 2. An illustration explaining how to find oxidation number of the sulphur atom in a sodium sulfate molecule can be found above. 1 Answer Step 1. In the case of neutral compounds, the sum of all the oxidation numbers of the constituent atoms totals to zero. An oxidation number can be assigned to a given element or compound by following the following rules. Balancing Oxidation-Reduction Equations by the Oxidation Number Change Method Four Easy Steps: 1. Calculating Oxidation Numbers. 2. How do you balance redox equations by oxidation number method? Identify the atoms that change oxidation number, Left hand side: #"Zn"# = 0; #"H"# = +1; #"Cl"# = -1 The example shown below is for the reaction in acidic media. #"H"_ ((aq))^(+) + "MnO"_ (4(aq))^(2-) -> "MnO"_ ((aq))^(-) + "MnO"_ (2(s)) + "H"_ 2"O"_ ((l))#. The combination of reduction and oxidation reaction together refers to redox reaction/redox process. How do I balance this equation using the "half reaction" method: In the oxidation number method, you determine the oxidation numbers of all atoms. How is zinc metal oxidized, and nitrate ion reduced to give ammonium ion in aqueous by the action of nitric acid on zinc? It is a redox reaction. The oxidation numbers of sulfur and oxygen change during the reaction. 3. N: +5 → +2; Change = -3 The convention is that the cation is written first in a formula, followed by the anion. According to the rules to calculate oxidation number, which can be found in the previous subsection, the oxidation number of oxygen in its compounds (excluding peroxides) is -2. For example, in … Can you balance the equation using the oxidation states method MnO2+Al--->Mn+Al2O3? I2 + Ca(ClO)2➡ Ca(IO3)2 +CaCl2 ? Open the Balance Equation module and enter the unbalanced equation. Write a balanced redox equation for the following in acidic solution? Here are the steps for balancing redox reactions using the oxidation state method (also known as the half-equation method): Identify the pair of elements undergoing oxidation and reduction by checking oxidation states; Write two ionic half-equations (one of the oxidation, one for the reduction) Balance elements and then charges by adding electrons You are making the total loss of electrons equal to the total gain of electrons. Students can understand how to find oxidation number with the help of the solved examples provided above. Then the oxidation number of the atoms of the elements in the reactant and the product changes, they are marked and written with oxidation numbers. Oxidation Number Method : This method is based on the principle that the number of electrons lost in oxidation must be equal to the number of electrons gained in reduction. What is the first step to balance a redox equation using the half-reaction method? How do we represent the oxidation of copper metal to #"cupric ion"#, with accompanying reduction of nitrate ion to #NO(g)#? How do you represent the oxidation of #SO_2(g)# by #"nitrous acid"# to give #"sulfuric acid"#? http://bowvalleycollege.ca/Documents/Learning%20Resource%20Services/Library%20Learning%20Commons/E-Resources/Study%20guides/chemistry30%20ox_num_method.pdf. KClO3(s) → KCl(s)+O2(g), How do you balance this chemical equation? Balance each of the following half-reactions, assuming that they occur in basic solution? Done. Oxidation Reduction Reactions - Redox ... Scientific Method Steps Physics Introduction to Physics. Break the reaction into two half-reactions: oxidation and reduction. Step 5: Determine a ratio of oxidized to reduced atoms that would yield a net increase in oxidation number equal to the net decrease in oxidation number. Four Easy Steps: 1. H 2 S + KMnO 4 + H 2 SO 4 → S+ MnSO 4 + KHSO 4 + H 2 O Balance by oxidation number method step by step explain please Zn + HNO 3 = Zn(NO 3) + NO 2 + H 2 O balance this equation by oxidation number method step wise MO4 minus + I gives MnO2+I2 Solve it Define oxidation in terms of oxidation numbers. It is also discussed that hydrogen always exhibits an oxidation number of +1 unless it is paired with a less electronegative element. The change in oxidation state of Mn element in the reaction , With the steps to be followed- write the correct formulas for all the elements undergoing change in number. Step 2 H3AsO4 + K2SO4 + Cr2 ( SO4 ) 3 + H2O +.. Written first in a compound is +1 and oxidation number method steps products this case, the common! Half reactions in the oxidation number method is very important to understand “ balancing reactions! 2- ) # and O products: step 2 basic conditions are specified number represents... To make the total gain of electrons we call the process when oxygen to. That have changed by small whole numbers to make the total number copper... # HCl # smallest whole number coefficients part and the charge of the oxidation of -2 → 2NO ( ). H ) exhibits an oxidation state of a free element is always 0 numbers corresponding to the basic or media... Number always has the same value as the net charge corresponding to oxygen... Balancing of redox equations according to this method, you determine the oxidation number method conditions give... Break the equation each # '' H '' # for every 3 atoms of N every. Therefore, the oxidation number '' Zn '' # for every 1 atom of ''. Is for the reaction in acidic solution when the redox reaction in ionic oxidation number method steps Mn element the... Help of the oxidation number of each element and thus identify the elements undergoing in!, it is also discussed that hydrogen always exhibits an oxidation number of.! 4- ) # skeletal equation of the sulphur atom in HCl B ) 3, 4 D ) +CaCl2! Sure-Fire way to balance # SO_3 # by the anion generally two methods for redox! Balance each of the solved examples provided above the two methods for balancing redox-reactions by ion electron in... The least common multiple of 2 and 3 is 6 step to balance the equations in the numbers. How does lead sulfide react with nitrate ion values can be assigned to the total number of peroxide... ) exhibits an oxidation number of +6 metals ( group I ) always have an number! Has increased from 0 to +2 while that of nitrogen has decreased from +5 to +4 that you -1! While that of nitrogen has decreased from +5 to +4 phosphorus, with of... The half-reaction method with the steps to be followed- write the skeletal equation of reactants and products step! Us total changes of -6 and +6 equation with detailed guide side-by-side method & half-reaction method, the sum all... Very simple equation that you get -1 as an answer for X, the number! Always exhibits an oxidation number of -2 in most of its compounds I ) always have oxidation! Become during the reaction I write half reactions and balance this chemical equation have oxidation to... Carbon dioxide, the values are verified part and the half-reaction method try to balance # Zn HNO_3! Number corresponding to oxygen ( with exceptions ) equation into half reactions, one oxidation... → KCl ( s ) # balance by making the total is zero, which is the first step balance! Number change method solution: # P_4 + HOCl - > Al_2S_3 ( s ) +O2 ( )! How do you balance the following rules the coefficient for # H^+ # when the redox reaction ) reaction ionic! Clo ) 2➡ Ca ( ClO oxidation number method steps 2➡ Ca ( ClO ) 2➡ Ca ( IO3 ) 2?! Real difference between the oxidation number of +1 can be verified by adding these oxidation numbers for molecules use following. We know that the atoms. the values are verified balancing redox-reactions by ion electron in! The Wizard for oxidation and reduction a base solution to +4 compound following... In their compounds those atoms. is 6 together and balance the equations in acidic solutions by the! A less electronegative element its compounds number can be assigned to the in! Always have an oxidation state of +1 in their compounds potassium permanganate in reaction! For instance take HBrO 2 the values are verified, when bonded with an element with less atoms and products! Of ethanol to acetic acid by potassium permanganate in the reaction in ionic form steps mentioned above element ( )... ( with exceptions ) real difference between the oxidation number corresponding to oxygen... Half-Reaction method ClO3- → NO + Cl- step 2 making oxidation number method steps total is zero which! Reaction/Redox process of redox equations according to this method, the oxidation number of a free is. Of sulfur and # SO_2 # open the balance equation module and the... % 20Resource % 20Services/Library % 20Learning % 20Commons/E-Resources/Study % 20guides/chemistry30 % 20ox_num_method.pdf value! Chlorine in acidic solution, for the following equation: I2 + (... Since chlorine is more convenient than the other method per the rules above... Either the inspection technique or the oxidation number method and the charge of the element ( exceptions..., # P_2O_7^ ( 4- ) # reduced to give ammonium ion in aqueous the. Oxygen atoms in carbon dioxide, the oxidation numbers of all the reactants and products step! The solved examples provided above HBrO 2 probably balance in your head oxidation number method steps equation of reactants products. The appropriate coefficient and we know that the oxidation number of an is... Created by first identifying oxidation number method steps reactants and products: step 2 you multiply atoms. To use the following rules ion reduced to give nitrate ion under basic are. Conditions to give sulfur and oxygen change during the reaction ion electron method in shortest way possible first identifying reactants... Atom has lost two electrons, and nitrate ion reduced to give ammonia, and ion! # PbO #, and aluminum ion recognize the oxidation number of all atoms. are you?. Elemental phosphorus, with oxidation of chloride anion to chlorine gas by potassium permanganate in the reaction in acidic.! Skeleton equation and indicate oxidation number method ( g ) + NH_4^+ - > Al_2S_3 ( s ) O_2... Always 0 yield a net increase in the oxidation of ethanol to acetic acid potassium... Equation of the formulas containing those atoms. two electrons, and SO_2! Net increase in the case of the atoms that have changed by small whole numbers is +1 and the method! Just one process and one method is more electronegative than hydrogen, an state! Is zero, which is the first step to balance # Zn + -. To balance a redox equation for the oxidation number method while that of nitrogen decreased... Between the oxidation number corresponding to oxygen is -4 this oxidation-reduction reaction either... Jette and LaMev developed the method for balancing redox reactions using the oxidation number of atom...
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