•
•#
of protons and # of neutrons determines mass and nuclear properties
–Same element (same Z) but different # of neutrons Þ isotope of same
element
–Isotopes behave same chemically, but have different nuclear properties
– 1H
= 1 proton, 0 neutrons (regular hydrogen)
– 2H
= 1 proton, 1 neutron (deuterium)
– 3H
= 1 proton, 2 neutrons (tritium)
–4He= 2 protons, 2 neutrons (regular helium)
–12C = 6 protons, 6 neutrons (regular carbon) 14C = ???