Atomic Element Z = 1 • Reactive Nonmetal

Hydrogen (H) — Atomic Data, Electron Shells & Reactions

Hydrogen (symbol H, atomic number 1) has a standard atomic weight of 1.008 u and ground-state configuration 1s1.

Full Atlas 2 He →

IUPAC Physical & Atomic Properties

Atomic Number (Z) 1 IUPAC Symbol H Standard Atomic Weight 1.008 g/mol Period / Group / Block 1 / 1 / s-block Condensed Electron Config 1s1 Full Subshell Config 1s1 Principal Shell Occupancy [1] Pauling Electronegativity 2.2 First Ionization Energy 1312 kJ/mol Covalent Radius 31 pm Melting Point 13.99 K (-259.16 °C) Boiling Point 20.27 K (-252.88 °C) Density 0.0000899 g/cm³ Oxidation States +1, -1

Bohr Shell Diagram & Balanced Reactions

H (Z=1) — Valence shell highlighted in vermilion

Interactive Stoichiometry Reactions Involving Hydrogen:

KMnO4 + HCl -> KCl + MnCl2 + Cl2 + H2O Cu + HNO3 -> Cu(NO3)2 + NO + H2O Cr2O7^2- + Fe^2+ + H+ -> Cr^3+ + Fe^3+ + H2O N2 + H2 -> NH3 CO2 + H2O -> C6H12O6 + O2 C6H12O6 + O2 -> CO2 + H2O