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