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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements1 Mark
Question
Is it possible to have an element having atomic number 1.5 placed between hydrogen and helium?
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Answer

Atomic number is always a simple whole number. It can either be 1 or 2. There can be no element with atomic number 1.5.

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