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Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074

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Chapter
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BuyFindarrow_forward

Chemistry & Chemical Reactivity

10th Edition
John C. Kotz + 3 others
ISBN: 9781337399074
Textbook Problem

What is the electron configuration of the H2+ ion? Compare the bond order of this ion with

He2+ and H2. Do you expect H2+ to exist?

Interpretation Introduction

Interpretation:

The electronic configuration of H2+ ion has to be written and its bond order should be compared with (He2+) and (H2-) ions. It should be determined that whether the given ion H2+ exist or not.

Concept Introduction:

Molecular orbital (MO) theory:  is a method for determining molecular structure in which electrons are not assigned to individual bonds between atoms, but are treated as moving under the influence of the nuclei in the whole molecule.

Bond order: The bond order has defined as the net number of bonding electrons pairs linking a pair of atoms. This same concept can be applied directly to molecular orbital theory, but not bond order is defined as.

Bondorder=12(NumberofelectronsinbondoingMOs-NumberofelectronsinantibondingMOs)

Explanation

Molecular orbital electronic configuration of H2+ ion is (σ1s)1(σ*1s)0

Exicitedstate1s1(σ1s)1(σ*1s)0

 Bond order of H2+ ion can be calculated as follows,

Bondorder=12(NumberofelectronsinbondoingMOs-NumberofelectronsinantibondingMOs)InH2+ionthereisnoantibondingelectrons,Therefore,Bondorder=12(1-0)=12

Molecular orbital electronic configuration of He2+ ion is written below,

 He2+ has three electrons. In according to the molecular orbital theory its electronic configuration can be written as,

(σ1s)2(σ*1s)1

LossofelectroninExicitedstate1s2(σ1s)2(σ*1s)1

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