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15 Cards in this Set
- Front
- Back
anion
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any atoms or group of atoms with a negative charge
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Binary compound
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a compound of two elements; NaCl and Al2O3 are binary compounds
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Cation
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any atom or group of atoms with a positive charge
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chemical formula
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shows the number and type of atoms present in the smallest representative unit of a substance; the chemical formula of ammonia,with one nitrogen and 3 hydrogens, is NH3
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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 is1:2 and the formula unit is Mg Cl2
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Ion
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an atom of group of atoms that has a positive or negative charge;cations are ions with a positive charge, and anions are ions with a negative charge
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ionic compound
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a compound composed of positive and negative ions
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Law of Definite Proportions
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in any sample of a chemical compound, the elements are always combined in the same proportions by mass
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Law of Multiple Proportions
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whenever two elements form more than one compound, the different masses of one element that combine with the same mass of the other element are in the ratio of small whole numbers
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Molecular Compound
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a compound that is composed of molecules
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Molecular Formula
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a chemical formula that shows the actual number and kinds of atoms present in a molecule of a compound
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Molecule
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a neutral chemically bonded group of atoms that act as a unit
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Monatomic Ion
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a single atom with a positive or negative charge as a result of losing or gaining Valence electrons
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Polyatomic Ion
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a tightly bound group of atoms that behaves as a unit and carries a charge
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Ternary Compound
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a compound containing atoms of three different elements, usually containing at least one polyatomic ion; Na2CO3 and Mg(OH)2are ternary ionic compounds
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