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Periodic Classification of Elements — Science STD 10 — Question

CBSE BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements2 Marks
Question
From the standpoint of atomic structure, what determines which element will be the first and which the last in a period of the periodic table?
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Answer

The no. of valence electrons in the atoms of elements decides which element will be the 1st element in a period and which will be the last in a period.

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