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Is it possible to have an element with a...

Is it possible to have an element with atomic number 1.5 placed between hydrogen and helium?

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No, it is not possible to have an element with atonic number 1.5. This is because the atomic number of an element is the number of protons or electrons in an atom of the element. Thus, atomic number has to always be a whole number and it can never be 1.5
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  1. Is it possible to have an element with atomic number 1.5 placed betwee...

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