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Ch.7 - Periodic Properties of the Elements
Chapter 7, Problem 63d

Chlorine reacts with oxygen to form Cl2O7 . (d) If the oxygen in Cl2O7 is considered to have the -2 oxidation state, what is the oxidation state of the Cl? What is the electron configuration of Cl in this oxidation state?

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1
Identify the oxidation state of oxygen in Cl2O7, which is given as -2.
Let the oxidation state of chlorine be x. Since there are two chlorine atoms, the total contribution from chlorine is 2x.
Set up the equation based on the sum of oxidation states in a neutral compound: 2x + 7(-2) = 0.
Solve the equation for x to find the oxidation state of chlorine.
Determine the electron configuration of chlorine in this oxidation state by considering the loss of electrons from its ground state configuration, [Ne] 3s^2 3p^5.

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