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Grade: 12

                        

Stability order - H2, B2, Li2 With explanation

6 years ago

Answers : (3)

Aarti Gupta
askIITians Faculty
300 Points
							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
6 years ago
Ishan
26 Points
							all have same bond order!
						
6 years ago
vinu
11 Points
							
@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.
 
4 years ago
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