Atoms and the Periodic Table

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Presentation transcript:

Atoms and the Periodic Table

Hydrogen 1 H 1.008 Element Name Atomic number Element Symbol Avg. Atomic Mass

} A. Basic Structure + + proton (+) neutron (Ø) Nucleus electron (-) electron cloud neutron (Ø) } + + Nucleus Nucleus: smallest yet heaviest part of the atom

A. Atomic Number Key Idea: Elements are different because they contain different numbers of protons. Atomic # = # Protons # electrons = # protons when atom is neutral

B. Mass Number (atomic mass units = a.m.u) Mass Number = total # of protons and neutrons.

C. To Find Neutrons Subtract: Mass # - Atomic # = Neutron #

Rutherford-Bohr Models of Atoms Hydrogen:

Rutherford-Bohr Models of Atoms Helium:

Rutherford-Bohr Models of Atoms Lithium

Rutherford-Bohr Models of Atoms Magnesium