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英英字典: atomic_number_2

atomic number 2   (TTS Sound)



Overview of noun atomic_number_2

The 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))

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