Can a number with atomic number 1.5 be placed between hydrogen and helium
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No.It is because in modern periodic table, elements are placed in increasing order of their atomic numbers. Atomic number is always a simple whole number as half electron or half proton cannot exist. It can be either 1 or 2.So, there can be no element with atomic number 1.5.
Anonymous:
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no because atomic number should be a whole number and not be a fraction number .
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