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11 Cards in this Set
- Front
- Back
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alloy
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a mixture composed of two of more elements, at least one of which is a metal
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chemical formula
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an expression that indicates the number and type of atoms present in the smallest representative unit of a substance
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coordination number
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the number of ions of opposite charge that surround each ion in a crystal
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electron dot structure
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a notation that depicts valence electrons as dots around the atomic symbol of the element; the symbol represents the inner electrons and atomic nucleus; also called Lewis dot structure.
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formula unit
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the lowest whole number ratio of ions in an ionic compound; in magnesium chloride, the ratio of magnesium ions to chloride ions is 1:2 and the formula unit is MgCl2 (small 2, like a footnote).
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halide ion
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a negative ion formed when a halogen atom gains an electron.
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ionic bond
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an electrostatic attraction that binds oppositely charged ions together
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ionic compound
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a compound composed of positive and negative ions
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metallic bond
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the force of attraction that holds metals together; it consists of the attraction of free-floating valence electrons for positively charged metal ions.
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octet rule
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atoms react by gaining of losing electrons so as to acquire the stable electron structure of a noble gas, usually 8 valence electrons
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valence electrons
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an electron in the highest occupied energy level
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