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Atoms and the Periodic Table
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Hydrogen 1 H 1.008 Element Name Atomic number Element Symbol
Avg. Atomic Mass
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} A. Basic Structure + + proton (+) neutron (Ø) Nucleus electron (-)
electron cloud neutron (Ø) } + + Nucleus Nucleus: smallest yet heaviest part of the atom
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A. Atomic Number Key Idea: Elements are different because they contain different numbers of protons. Atomic # = # Protons # electrons = # protons when atom is neutral
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B. Mass Number (atomic mass units = a.m.u)
Mass Number = total # of protons and neutrons.
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C. To Find Neutrons Subtract: Mass # - Atomic # = Neutron #
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Rutherford-Bohr Models of Atoms
Hydrogen:
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Rutherford-Bohr Models of Atoms
Helium:
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Rutherford-Bohr Models of Atoms
Lithium
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Rutherford-Bohr Models of Atoms
Magnesium
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