Chemistry Concepts

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alloy

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a combination; a mixture of two or more metals

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endothermic

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Chemical reaction that absorbs energy

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exothermic

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A chemical reaction that releases energy

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malleability

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the ability of a substance to be hammered or beaten into thin sheets

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corrosion

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The gradual wearing away of a metal element due to a chemical reaction.

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alkali metals

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Group 1 elements that have 1 electron in outer level, very reactive, soft, silver, shiny, low density

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halogens

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Group 17 on the PTE; contains nonmetals, 7 valence electrons in its outermost energy level. Very reactive

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noble gases

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Elements in group 18 of the periodic table. Least reactive elements and are gases under normal conditions; Valence electron shell is full

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period

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A horizontal row of elements in the periodic table

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group

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a vertical column of elements in the periodic table