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Element	Symbol	Atomic Number	Approximate Atomic Weight	Usual Valence
Aluminum	Al	13	27	+3
Antimony	Sb	51	122	+3, +5
Argon	Ar	18	40	0
Arsenic	As	33	75	+-3, +5
Barium	Ba	56	137	+2
Bismuth	Bi	83	209	+3, +5
Boron	B	5	11	+3
Bromine	Br	35	80	-1
Cadmium	Cd	48	112	+2
Calcium	Ca	20	40	+2
Carbon	C	6	12	+-4
Chlorine	Cl	17	35.5	-1
Chromium	Cr	24	52	+3, +6
Cobalt	Co	27	59	+2
Copper	Cu	29	63.5	+1, +2
Flourine	F	9	19	-1
Gold	Au	79	197	+1, +3
Helium	He	2	4	0
Hydrogen	H	1	1	+1
Iodine	I	53	127	-1
Iron	Fe	26	56	+2, +3
Lead	Pb	82	207	+2, +4

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