hydrogen

neutronium$\longleftarrow$ 1 $\longrightarrow$helium

Pronunciation

• IPA ^(key): /ˈhaɪdrədʒən/

• Audio (US)

  (file)

• Hyphenation: hy‧dro‧gen

Noun

Singular hydrogen

Plural hydrogens

Hydrogen's place on the periodic table

An airship full of hydrogen gas

1. (uncountable) Hydrogen is the lightest chemical element (symbol H) with an atomic number of 1.

   Hydrogen gas is highly flammable.

Related words

• hydrogen bomb

See also

• positronium
• protium
• deuterium
• tritium