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Chemical element

species of atoms having the same number of protons in the atomic nucleus and the same chemical properties, but not necessarily the same mass, or the same stability (or half-lifetime if they are unstable)

A

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B

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C

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D

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E

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F

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G

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H

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I

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K

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L

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M

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N

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O

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P

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R

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S

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T

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U

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V

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X

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Y

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Z

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 See also: Chemistry.
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