Acovalent bond between to atoms results when the atoms lose or gain electrons share electron pairs transfer valence electrons conmpletely from one atom to the other realease energy

A covalent bond is between 2 atoms results in the sharing of electron pairs. B

Idon’t know sorry i don’t know the answer i’m s sorry

The problem here is that according to aufbau principle before 3d orbital 4s subshell comes.after filling 3p orbital with electrons you have 4 electrons left, you place two in 4s with opposite spin and the other two in 3d in any of its two orbitals of total five orbitals with the same spin.