Matching Pairs Atomic Structure MatchingOnline version 8.5AB by Courtney Cox 1 charge of neutron 2 cloud 3 charge of electrons 4 charge proton 5 atomic mass = 6 Reactive Atom 7 valence electrons 8 Stable Atom 9 nucleus area surround the nucleus positive + no charge, 0 negative - protons + neutrons sad atom, doesn't have a full valence shell (less then 8) so it wants to bond with others electrons farthest from the nucleus, responsible for reactivity/bonding happy atom! Has a full valence shell (8ve-) center of an atom, contains protons and neutrons