Atomic Structure and Bohr Model

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atomic number
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number of protons in an atom
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atomic mass
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number of protons + neutrons in an atom
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nucleus
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the center of an atom
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proton
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A part of the atom with a positive (+) charge. Located in nucleus. Mass = 1 amu
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neutron
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A part of the atom with no (0) charge. Located in nucleus. Mass = 1 amu.
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electron
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A part of the atom with a negative (-) charge. Located in energy levels. Almost no mass.
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energy level
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Located outside of nucleus. Electrons are located here.
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symbol
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abbreviation for an element.
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number of neutrons
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atomic mass – atomic number
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element
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all atoms with same number of protons. Examples: all atoms with 1 proton are called hydrogen. All atoms with 2 protons are called helium.
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Bohr Model
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model of the atom where electrons exist only in energy levels. It is still very useful today.
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valence electron
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an electron in the highest energy level of an atom
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group
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vertical column in periodic table
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period
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horizontal row in periodic table
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ion
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an atom that has gained or lost electrons
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octet rule
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atoms are more stable when their outer energy level is full
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metals
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elements that are in BLUE in this periodic table.
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non-metals
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elements that are in YELLOW in this periodic table

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