Which diatomic molecule of second period basides `O_(2)` should be paramagnetic ? .

Explanation

`B_(2): (sigma1s)^(2)(sigma.^(*) 1s)^(2)(sigma2s)^(2)(sigma.^(*)2s)^(2)(sigma2p_(z))^(2)(pi2p_(x))^(2)`
`=(pi 2p_(y))^(2) (pi .^(*)2p_(x))^(1)=(pi.^(*)2p_(y))^(1) (pi *2p_(z))^(0)`
As paramagnetism arises due to unpaired electron Therefore `B_(2)` is paramagnetic molecule .