Chemical bonds are likely to form when a. two atoms have the same number of electrons. b. an atom’s outer energy level doesn’t have the maximum number of electrons. c. an atom’s nucleus has the same number of protons as neutrons. d. an atom’s outer energy level is filled.

B

Explanation:

Octat rule:It is the ability to have 8 electrons in last shell

An atom is said to be stable ,and on lower energy it must fill the last shell.

To complete last shell an atom tends to shair or transfer electrons.

If both are non metals the they will form covalent bond.

If one atom is metal and other one is non metal then ionic bond is formed.