Periodic table / Other non-metals
1Hydrogen
Hydrogen is an other non-metal in group 1, period 1. At 25 °C it is a gas.
- Symbol
- H
- Atomic number
- 1 protons in the nucleus
- Standard atomic weight
- 1.0080 ± 0.0002Commercial samples can have a changed isotope mix, because material has been processed or isotopes removed (for example lithium sold after its lithium-6 was taken out).
- Electron configuration
- 1s1
- Electrons in each shell
- 1
- Group, period, block
- 1, 1, s
- Family
- Other non-metals
- State at 25 °C
- gas
- Electronegativity
- 2.2 (Pauling scale)
- First ionisation energy
- 1312 kJ/mol (13.598434599702 eV)
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Where these numbers come from
Atomic weight: IUPAC CIAAW, abridged standard atomic weights 2024. Electron configuration and ionisation energy: NIST Atomic Spectra Database. Family, state and electronegativity: PubChem. See Sources. Melting points, boiling points and densities are left out for now: published values differ between sources, and we will add them once each has been checked.