About helium and hydrogen | hydrogen |helium
Periodic table
1.Hydrogen
Latin name: Hydrogenium
English name: Hydrogen
Year discovered: 1766
Discovered by: Henry Cavendish
Electrons: 1
Protons: 1
Neutrons: 0
Properties :
Atomic number: 1
Atomic weight (Relative atomic mass): 1.0079 (g/mol)
Density: 0.0000899 (g/cm³)
Melting point: -259.1 °C = -434.38 °F = 14.05 K
Boiling point: -252.9 °C = -423.22 °F = 20.25 K
Period: 1
Group: IA
Block: s - block
Definition : hydrogen is chemical element with chemical symbol H and atomic with an atomic weight of 1.007944 hydrogen is the lightest element on the periodic table it's montomic form (H) is most abond and chemical substance in the universe constitutes roughly 75% of all bbaryonic mass.
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