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Which element has the atomic number 1, helium or hydrogen?

+3 votes

asked Apr 17, 2023 in Atomic Number by Greentram
edited Apr 22, 2023 by physguru

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+3 votes

answered Apr 22, 2023 by meander (4.0k points)

The element with atomic number 1 is hydrogen. Helium, on the other hand, has atomic number 2. Hydrogen is the lightest and simplest element in the periodic table, while helium is the second lightest element.

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