Answer for below questions for the following ion ...?

Question

O2(-2)

1.)How many electrons are in bonding orbitals ?
2.)How many electrons are in anitbonding orbitals ?
3.) What is the bond order of the ion.

Answer 1

the electronic configuration of molecular orbital are---
sigma(say#)1S2, #*1S2, #2S2, #*2S2, #2Pz2, Pai(say $)2Px2=$2Py2, $*2Px2=$*2Py2,
Thus bonding orbital electron are-(count ele having without star mark(*)=10(Nb)
and antibonding orbital electron are- -(count ele having star mark(*)=8(Na)
thus bond order is 10-8/2=1
i.e the bond order is 1