elements and compounds chemistry

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Last updated 9:32 PM on 10/8/26
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11 Terms

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element

A pure substance that cannot be separated into simpler substances

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horizontal row on periodic table

period

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vertical rows on periodic table

group / family

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First Periodic Table by

Dmitri Mendeleev

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compound

composed of 2 or more different Elements that are chemically combined in a fixed ratio.

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law of definite proportions

?

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percent by mass

the ratio of the mass of each element to the total mass of the compound expressed as a percentage.

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mixture

a combination of two or more pure substances in which each pure substance retains its individual chemical properties (infinite number)

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Heterogeneous Mixture

individual substances remain distinct - not blended smoothly throughout.

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Homogeneous Mixture

Constant composition throughout. Also called solution

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Alloy

homogeneous mixture of metals or a metal and a non-metal where metal is the major component