The Atom.

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Unit 3: Atomic Structure Atomic Number, Mass Number, and Isotopes.

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Presentation transcript:

The Atom

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.

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 (+).

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

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)

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

Let’s Try… Cl P = E = N = Mg Ne