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18 Cards in this Set
- Front
- Back
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Atoms
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The smallest particle of an element.
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Atomic Mass
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The mass of an atom in atomic mass units; the average mass of the atoms of an element.
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Atomic mass unit
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One-twelfth the mass of atom.
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Atomic number
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The number of protons in the nucleus of an atom.
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Atomic symbol
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the number of positive charges or protons in the nucleus of an atom of a given element, and Therefore also the number of electrons normally surrounding the nucleus.
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Nucleus
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A central part about which other parts are grouped or gathered.
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Period
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A horizontal row of the periodic table.
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Proton
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Positive nucleon.
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Subatomic particle
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A particle smaller than an atom.
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Chemical Symbol
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A notation using one to three letters to represent an element.
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Electron
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An elementary particle with unit negative charge.
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Group
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The elements of a vertical column in the prriodic table.
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Isotope
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One of two or more atoms having the same number of protons but different numbers of neutrons.
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Mass number
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The total number of protons and neutrons in nucleus.
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Metal
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An element that tends to lose electrons in chemical reactions.
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Metalloid
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An element that has properties characteristic of a metal and a nonmetal.
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Neutron
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A neutral subatomic particle; a hadron
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Nonmetal
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An element that tends to gain elecetrons in chemical reactions.
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