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H; Atomic number 1; atomic weight 1.00794; melting point -259.14°C; boiling point -252.8°C; density at 0°C 0.08987 gram per liter; valence 1.
Hydrogen
He; Atomic number 2; atomic weight 4.0026; boiling point -268.9°C; density at 0°C 0.1785 gram per liter.
Helium
Li; Atomic number 3; atomic weight 6.941; melting point 179°C; boiling point 1,317°C; specific gravity 0.534; valence 1.
Lithium
4 Be 9.0122
Beryllium
5 B 10.811
Boron
6 C 12.0107
Carbon
7 N 14.0067
Nitrogen
8 O 15.9994
Oxygen
9 F 18.9984
Fluorine
10 Ne 20.1797
Neon
11 Na 22.9897
Sodium
12 Mg 24.305
Magnesium
13 Al 26.9815
Aluminium
14 Si 28.0855
Silicon
15 P 30.9738
Phosphorus
16 S 32.065
Sulfur
17 Cl 25.452
Chlorine
19 Ar 39.0983
Argon
20 K 39.0983
Potassium
20 Ca 40.078
Calcium
24
Chromium
25 Mn 54.938
Manganese
26 Fe 55.845
Iron
27 Co 58.9332
Cobalt
28 Ni 58.6934
Nickel
29 Cu 63.546
Copper
30 Zn 65.39
Zinc
35 Br 79.904
Bromine
47 Ag 107.8682
Silver
50 Sn 118.71
Tin
53 I 126.9045
Iodine
74 W 183.84
Tungsten
79 Au 196.9665
Gold
80 Hg 200.59
Mercury
82 Pb 207.2
Lead