Atomic Number 2 — synonyms, definition

1. atomic number 2 (Noun)

2 synonyms
He helium
1 definition

atomic number 2 (Noun) — A very light colourless element that is one of the six inert gasses; the most difficult gas to liquefy; occurs in economically extractable amounts in certain natural gases (as those found in Texas and Kansas).

5 types of
argonon chemical element element inert gas noble gas
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