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Jan 05, 2016
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Dmitri Mendeleev
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The tendency to recur at regular intervals
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The physical and chemical properties of the elements repeat in a regular pattern when
they are arranged in order of increasing atomic number
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period
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Group or family
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Alkali metals
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H, Li, Na, K, Rb, Cs, Fr
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Li, Na, K, Rb, Cs, Fr
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1
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Alkaline earth metals
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1
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2
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2
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Be, Mg, Ca, Sr, Ba, Ra
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Alkaline earth metals
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Alkali metals
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halogens
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F, Cl, Br, I, At
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7
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halogens
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18
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17
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He, Ne, Ar, Kr, Xe, Rn
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solid
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Br and Hg
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H, N, O, F, He, Cl, Ne, At, Kr, Xe, Rn
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metals
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metals
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B, Si, Ge, As, Sb, Te, Po, At
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B
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Ne
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Inner transition elements
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7
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8
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Cl
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Mg
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Al
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P
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K
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Ca
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Po or As
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F
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2
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5
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3
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2
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Ca
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S
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K
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As
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Ga
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Mg
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H
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Cl
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H
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4
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8
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Be
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F
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Na
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Si
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S
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Be
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7
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