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Question
According to atomic structure, what determines which element will be the first and which will be the last in a period?
Short/Brief Note
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Solution
The electronic configuration of an element determines its position in Modern Periodic table.
The element with one valence electron is the first while the element with 8 valence electrons is placed in the 18th group of a period.
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Chapter 1: Periodic Table, Periodic Properties and Variations of Properties - lntext Questions [Page 5]
