Why does helium exist only as single atoms?
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Helium, the second element, has 2 protons and 2 electrons, so its shell is full and stable for each atom. Therefore, He does NOT form molecules - it exists as single atoms (monoatomic)
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Helium is a inert gas and So, it does not react with any other substances so, the atom of helium is very stable and dies not combine with any other atom.
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