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It comes second because it has the second lowest relative atomic mass (2).

The reason it is on the right hand side instead of the left is because it is a noble gas and has a full outer shell of electrons.

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14y ago
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13y ago

Helium is the second element, on the first column last row. Hope this helps

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13y ago

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Q: What role and column is helium in on the periodic table?
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