hydrogen

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The Simple English Wikipedia has an article on:

neutronium 1 helium

Pronunciation[change]

  • IPA: /ˈhaɪdrɘdʒɘn/
  • (file)
  • Hyphenation: hy‧dro‧gen

Noun[change]

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[change]

See also[change]