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Question

Calculate the bond order of O2-.


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Solution

Calculation of bond order of O2-

Step 1: Calculating the total number of electrons in O2-
The number of electrons in O = 8
The number of electrons in O2 = 16
The number of elctelectronsrons in O2- = 17

Step 2: Determination of electronic configuration of O2-
[σ(1s)]2[σ∗(1s)]2[σ(2s)]2[σ∗(2s)]2[σ(1pz)]2[π(2px)]2[π(2py)]2[π∗(2px)]2[π∗(2py)]1

Step 3: Determining the number of electrons in bonding molecular orbitals
The number of bonding electrons = 10

Step 4: Determining the number of electrons in anti-bonding molecular orbitals
The number of anti-bonding electrons = 7

Step 5: Calculation of bond order
Bond order = Numberofelectronsinbonding-Numberofelectronsinantibonding2
Bond order = 10-72
Bond order = 32
Bond order = 1.5

Hence, the bond order for O2- is 1.5.


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