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Chemistry & Chemical Reactivity

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

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BuyFindarrow_forward

Chemistry & Chemical Reactivity

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

Give the electron configurations for the ions Li2+ and Li2 in molecular orbital terms. Compare the Li–Li bond order in these ions with the bond order in Li2.

Interpretation Introduction

Interpretation:

The electron configurations of Li2+andLi2 ion in molecular orbital term should be written, its bond order has to be calculated and it should be determined that whether the Li-Li stronger or weaker in Li2+andLi2 than in Li2.

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
  • The (Li2) molecule has six electrons from two lithium atoms. Its electronic configuration in molecular orbital term is σ1s2σ*1s2σ2s2.

  (Antibondingelectrons)(σ*2s)02s2s(Bondingelectrons)(σ2s)2

  (Antibondingelectrons)(σ*1s)2Li(1s2)Li(1s2)(Bondingelectrons)(σ1s)2MolecularorbrbitalenergydiagramforLi2molecule

Bond order of  Li2 can be calculated as follows,

Bondorder=12(NumberofelectronsinbondoingMOs-NumberofelectronsinantibondingMOs)Bondorder=(42)2=22=1

  • The (Li2) molecule has seven electrons. Its electronic configuration in molecular orbital term is σ1s2σ*1s2σ2s2σ*2s1

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