Match the terms to their descriptions.
proton - neutron - electron - electron cloud - valence electron - valence shell - isotopes

1) region outside the nucleus divided into energy levels
2) located in the outermost energy level, determines how element will react chemically with other elements.
3) outermost energy level
4) atoms that have the same number of protons but different numbers of neutrons
5) located in the nucleus, neutral or no charge
6) located outside the nucleus, charge
7) located in the nucleus, positive(+) charger