1. The Atom

3. Nucleus is made up of protons (+) and neutrons (no charge-neutral)
Nucleus contains most of the atom’s mass
Nucleus is very small compared to rest of atom. Similar in size to a paper clip on a football field.

4. Nucleus has a positive (+) charge (because of the protons) BUT the atom is usually neutral. The electrons (-) are found around the nucleus & balance out the protons (+).

6. The # of protons, electrons, & neutrons of an atom can be determined by the periodic table

8. Atomic # = # of protons and electrons
Mass #= # of protons plus neutrons
(Avg. Atomic mass is the decimal # on P.T. & mass # is just the average rounded)

9. To FIND THE # OF… Protons…..it is the ATOMIC #
Electrons….it is the ATOMIC #
Neutrons….MASS #– ATOMIC #

10. Let’s Try… Cl
P = E = N = Mg Ne