atomic number 2

Noun
  1. is a type of:
    • chemical element, element - any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
    • argonon, inert gas, noble gas - any of the chemically inert gaseous elements of the helium group in the periodic table
    same as: he, helium

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