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Asked by Abhiram Shibu

Oct 29, 2014

Compare the stabilities of O2 , O2-,O22- .

Compare the stabilities of O2 , O2-,O22-  .

Answers(3)

Answer

Rajan Raman

Member since

Ans: The stabilities of these can be best explained using Molecular orbital theory.
 
(i)                            Formation Oxygen molecule:
Electronic configuration of oxygen atom-1s² 2s² 2p⁴
Atomic orbitals of oxygen combine to form molecular orbitals.
BO = bonding orbitals 
ABO = Anti-bonding orbitals
 O2:
Electronic configuration of Oxygen molecule = 



Bond order in Oxygen molecule (O2)=
=½ [(Number of bonding electrons) – (number of anti-bonding electrons)]
= ½ [10 – 6]
= 2

O2:
Bond order in Oxygen molecule (O2-2)
=½ [(Number of bonding electrons) – (number of anti-bonding electrons)]
= ½ [10 – 8]
= 1
With the increase in number of electrons in anti-bonding orbital the stability and bond order of the molecule decreases.
 Thus Decreasing order of stability is: O2 > O2- > O2-2

Shreyansh Jain

Member since

Bond Order(B.O) of O2=2,O2-=1.5,O22-=1
so stability depends on how high is the bond order so O2>O2->O22-

Satyanarayana Prasad

Member since Apr 24, 2013

Ans: The stabilities of these can be best explained using Molecular orbital theory.
 
(i)                            Formation Oxygen molecule:
Electronic configuration of oxygen atom-1s² 2s² 2p⁴
Atomic orbitals of oxygen combine to form molecular orbitals.
BO = bonding orbitals 
ABO = Anti-bonding orbitals
 O2:
   

Electronic configuration of Oxygen molecule = 



Bond order in Oxygen molecule (O2)=
=½ [(Number of bonding electrons) – (number of anti-bonding electrons)]
= ½ [10 – 6]
= 2

O2:

Bond order in Oxygen molecule (O2-)
=½ [(Number of bonding electrons) – (number of anti-bonding electrons)]
= ½ [10 – 7]
= 1½
 
O2-2:

Bond order in Oxygen molecule (O2-2)
=½ [(Number of bonding electrons) – (number of anti-bonding electrons)]
= ½ [10 – 8]
= 1
With the increase in number of electrons in anti-bonding orbital the stability and bond order of the molecule decreases.
 Thus Decreasing order of stability is: O2 > O2- > O2-2
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