Why do atoms bond? some atoms are sticky so they stick to other atoms. they have too many electrons on their inner shell and need to give some away. they want to fill up their nucleus in order to become stable. they want to fill up their outer electron shell in order to become stable.

They want to fill up their outer electron shell in order to become stable.  All things in life are made from atoms and all atoms want to reside in their lowest energy state because it is most stable.  To do so, atom either share, give, or gain electrons to achieve this stability.

answer: the answer is a

mass and volume are the answers you are looking for