Asked Oct 18, 2019

From the ground-state electron configurations of Li2 and Be2, predict which molecule should have the greater dissociation energy.

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Step 1

Write the electronic configuration of the given molecules as per molecular orbital theory.

als2, o1s2, 2s2
ols2 1s2 2

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Liz: als2, o1s2, 2s2 Bez: ols2 1s2 2 o*2s2

Step 2

Calculate bond order for both the molecules:

                  Bond order = (bonding e- - anti bonding e- ) / 2

 Li2 :

Bonding electrons = 4

Anti-bonding electrons = 2    

So, Bond order = 4-2...

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