Question

The number of unpaired electrons in a paramagnetic atom of an element with atomic number $16$ is :

Answer 1

We use $(\sigma 1s{)}^2,({\sigma }^{\ast }1s{)}^2,(\sigma 2s{)}^2,({\sigma }^{\ast }2s{)}^2,(2p_z{)}^2,(\pi {)}^4,({\pi }^{\ast }{)}^2$.
Anti bonding pi molecular orbital has two unpaired electrons.