The more similar elements are closer together based on atomic number true or false dont answer if you dont know

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.

Answer ozone (o3) is made of three atoms of oxygen, it is a molecule;

Ithink iit might be

The answer to your q it is d