Hybridization

 The atomic orbitals of same energy or nearly same energy intermix to give new orbitals of same energy

# Half filled orbitals.   

   Empty orbitals.       

   Full filled orbitals. 

All can do hybridization

# The number of hybrid orbitals = Number of intermixing orbitals

# The concept of hybridization is for Sigma(single bond) bond and lone pair.

# Hybrid orbitals are named after the parent orbital 

1s + 1p = sp, sp 

1s + 2p = sp2, sp2