ATOMIC NUMBER OF HELIUM Crossword Clue
ATOMIC NUMBER OF HELIUM Crossword Clue
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Crossword Puzzle Infos
The atomic number of helium is TWO (2). This is because helium has TWO protons in its nucleus, which is the defining characteristic of an element's atomic number. Helium is a noble gas and is the second lightest element on the periodic table. It is colorless, odorless, and tasteless, and is the most abundant element in the universe.