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Stability order - H2, B2, Li2 With explanation

Stability order -
H2, B2, Li2
With explanation

Grade:12

3 Answers

Aarti Gupta
askIITians Faculty 300 Points
10 years ago
The stability order for these molecules will be:-B2>H2>Li2.When we calculate the bond order we find for B2 molecule it is 2,and for H2 and Li2 it is 2 for both.This clears that between these three molecules B2 will be most stable as it has highest bond order,and when the bond order is high it indicates that atoms are tightly held to each other making the molecule stable.Now for Li2 and H2 as both have same bond order we have to look at the distribution of electrons in bonding as well antibonding orbitals.In such case we observed that H2 has electrons only in bonding orbital and antibonding orbital is empty,but in Li2 molecule the electrons are in antibonding orbital also,so it will be less stable than H2 molecule.
Thanks & regard
Aarti Gupta
askiitians Faculty
Ishan
26 Points
10 years ago
all have same bond order!
vinu
11 Points
8 years ago
@Aarti Gupta
correct answer is H2>B2>Li2
“The stability order for these molecules will be:-B2>H2>Li2.When we calculate the bond order we find for B2 molecule it is 2,and for H2 and Li2 it is 2 for both.This clears that between these three molecules B2 will be most stable as it has highest bond order,and when the bond order is high it indicates that atoms are tightly held to each other making the molecule stable.Now for Li2 and H2 as both have same bond order we have to look at the distribution of electrons in bonding as well antibonding orbitals.In such case we observed that H2 has electrons only in bonding orbital and antibonding orbital is empty,but in Li2 molecule the electrons are in antibonding orbital also,so it will be less stable than H2 molecule.” is wrong.
 

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