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Modern Periodic Table and Periodic Properties — Chemistry STD 10 — Question

ICSE BoardEnglish MediumSTD 10ChemistryModern Periodic Table and Periodic Properties2 Marks
Question
An element has atomic number 19. Where would you expect this element in the Periodic Table and why?
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Answer

The electronic configuration of the element is (2, 8, 8, 1)
(i) As the element has four electron shells, it belongs to 4th period.
(ii) As the element has one electron in the valence shell, it belongs to group 1.

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