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17 Cards in this Set
- Front
- Back
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PT: group
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vertical columns
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PT: period
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horizontal rows
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pt: Metals
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first 2 groups, minus H.. Entire middle section, including removed portion, and elements to the right of the stairstep, including Al and Po
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pt: Nonmetals
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Hydrogen, Plus colums 14-18 on right side of stair step line
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pt: Metalloids
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Elements along both sides of stairstep line, minus Al, Po, At
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pt: elements in a group
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have similar chemical properties
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pt: elements in a period
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have different chemical properties
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diatomic molecules
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N2, O2, F2, Cl2, Br2, I2
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tetratomic molectule
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P4
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octatomic molecules
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S8, Se8
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Atomic Number (Z)
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Number of PROTONS
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Mass Number (A)
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number of protons + neutrons
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Isotopic Symbol
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AZ X
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Atomic Mass
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mass of a single atom
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Molecular Mass
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mass of a single molecule (sum of atomic masses of each atom in molecule)
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Formula mass
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the sum of the atomic masses of each atom in a formula unit (ionic compounts, not molecules, but crystalline)
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Average Atomic mass
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Atomic mass when all isotopes and their relative percentages are taken into account
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