atomic number 1

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas;
the simplest and lightest and most abundant element in the universe
• Syn:
hydrogen, H
• Derivationally related forms:
hydrogenate (for: hydrogen)
• Hypernyms:
chemical element, element, gas
• Hyponyms:
tritium
• Substance Holonyms:
water, H2O