atomic number 2

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Noun atomic number 2 has 1 sense

helium, He, atomic number 2 - a very light colorless 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)
--₁ is a kind of chemical element, element; noble gas, inert gas, argonon

atomic explosion atomic fission atomic mass atomic mass of lithium atomic mass unit atomic nucleus atomic number atomic number 1 atomic number 2 atomic number 3 atomic number 4 atomic number 5 atomic number 6 atomic number 7 atomic number 8 atomic number 9 atomic number 10

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