HII

See also: hii, H II, and H-II

Translingual

Alternative forms

• H-II, H II, HII

Etymology

H (“hydrogen”)+II (“2”)

Symbol

H_II

1. (chemistry, spectroscopy) ionized hydrogen; an atomic hydrogen ion needing 1 electron to become neutral; a free hydrogen nucleus; a hydron

Synonyms

• H⁺
• H¹⁺

Hyponyms

• D⁺
• D¹⁺
• T⁺
• T¹⁺
• p (proton)

Related terms

• H_I (neutral atomic hydrogen)
• H (hydrogen)

Descendants

• English: H_II emission line, HII emission line, H-II emission line, H II emission line
• English: H_II region, HII region, H-II region, H II region

See also

• H-2 (deuterium)
• H₂ (dihydrogen, molecular hydrogen)