CHEM:ATOM FOC 2E CL (TEXT)
CHEM:ATOM FOC 2E CL (TEXT)
2nd Edition
ISBN: 9780393284218
Author: Stacey Lowery Bretz, Natalie Foster, Thomas R. Gilbert, Rein V. Kirss
Publisher: WW Norton & Co
Question
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Chapter 5, Problem 5.103QA
Interpretation Introduction

To find:

The Bond order of N2+, O2+, C2+, and Br22- from the MO theory and predict the bond orders.

Expert Solution & Answer
Check Mark

Answer to Problem 5.103QA

Solution:

1) Bond order of N2+ = 2.5

2) Bond order of O2+ = 2.5

3) Bond order of C2+ = 1.5

4) Bond order of Br22- = 0

All species with nonzero bond order may exist, therefore, N2+, O2+ and C2+ may exist.

Explanation of Solution

The Molecular orbital diagram of N2+, O2+, C2+, and Br22- are below

CHEM:ATOM FOC 2E CL (TEXT), Chapter 5, Problem 5.103QA

1) Bond order of N2+

:

Electronic configuration of N2+ is

(σ1s)2(σ*1s)2(σ2s)2(σ*2s)2(π2px)2(π2py)2(σ2pz)1

Bond order =(Bonding electrons  Nonbonding electrons2)= (9-4)2= 2.5

2) Bond order of O2+:

Electronic configuration of O2+ is

(σ1s)2(σ*1s)2(σ2s)2(σ*2s)2(σ2pz)2(π2px)2(π2py)2(π*2px)1

Bond order =(Bonding electrons  Nonbonding electrons2)= (8-3)2= 2.5

3) Bond order of C2+:

Electronic configuration of C2+ is

(σ1s)2(σ*1s)2(σ2s)2(σ*2s)2(π2px)2(π2py)1

Bond order =(Bonding electrons  Nonbonding electrons2)= (7-4)2= 1.5

4) Bond order of Br22- :

In case of Br22- after 4s there is 3d subshell which makes the orbital diagram complicated and as it is completely filled, it is going to cancel out with bonding and antibonding electrons;hence, it is neglected in this case. Valence electronic configuration of Br22- is

(σ4pz)2(π4px)2(π4py)2(π*4px)2(π*4py)2(σ*4pz)2

Bond order =(Bonding electrons  Nonbonding electrons2)= (6-6)2= 0

The bond order of Br22- is 0 because bonding and antibonding electrons are equal.

All species with nonzero bond order may exist, therefore, N2+, O2+ and C2+ may exist.

Conclusion:

The bond order of the given molecular ions is calculated from the MO diagram. It is used to check the existence of species from the bond order.

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Chapter 5 Solutions

CHEM:ATOM FOC 2E CL (TEXT)

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