Which statement best explains why radon and krypton do not bond easily with other elements? O. They have many electron shells, so their protons do not attract electrons strongly.
O They have eight electrons in their valence shells, so they are stable without gaining or losing electrons.
O Their valence shells are empty, so they do not need to bond with other elements to be more stable.
O Their valence shells are so close to the protons in the nucleus that bonding cannot happen like in other elements.​