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1 2 3 4 5 6 7 89 10 11 12 13 14 15 1617 18 19 20 21 22 23 2425 26 27 28 29 30 31 3233 34 35 36 37 38 39 4041 42 43 44 45 46 47 4849 50 51 52 53 54 55 5657 58 59 60 61 62 63 64
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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