Periodic Table of the Elements 2 13 1 14 15 16 17 18 (1) (2) (3) (4) (5) (6) (7) (8) 1 2 −1 0 +1 H He 1 (1s) Hydrogen Helium 1.008 4.003 80 Liquid at 25 °C Atomic number +1 +2 2 (2p) (2s) Zn Oxidation states Solid at 25 °C Elemental symbol Mercury He 200.59 Gas at 25 °C Atomic mass 3 (3s) 7 (3d) (4p) 4 (4s) (4d) (5p) 5 (5s) (5d) (6p) 6 (6s) (6d) (7p) 7 (7s) 6 (4f)
1 2 Periodic Table of the Elements 13 14 15 16 17 18 (1) (2) (3) (4) (5) (6) (7) (8) 1 −1 2 0 +1 1 (1s) H He Hydrogen 1.008 Helium 4.003 2 (2s) Atomic number Elemental symbol 80 +1 +2 Mercury Oxidation states Liquid at 25 °C Zn Solid at 25 °C (2p) Atomic mass 200.59 He Gas at 25 °C 3 (3s) 7 4 (4s) 5 (5s) 6 (6s) 7 (7s) (3d) (4d) (5d) (6d) (4p) (5p) (6p) (7p) 6 (4f)
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