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Periodic table of elements - ScienceGeek.net
www.sciencegeek.netPeriodic table of elements 1 Hydrogen 1.0079 1 H He 2 Helium 4.0026 2 Li 3 Lithium 6.9410 2 1 Be 4 Beryllium 9.0122 2 2 Ne 10 Neon 20.1797 2 F 8 9 Fluorine 18.9984 2 O 7 8 Oxygen 15.9994