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Identify the atomic number corresponding...

Identify the atomic number corresponding to least number of valence electrons

A

19

B

15

C

35

D

34

Text Solution

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The electronic configuration of an element with atomic number 19 is 2, 8, 8, 1, number of valence electrons is 1, similarly, the electronic configuration of elements with atomic numbers 15, 35 and 34 are 2, 8,5, 2, 8, 18, 7 and 2, 8, 18, 6, respectively and the valence electrons are, 5, 7 and 6, respectively. So, the atomic number corresponding to least number of valence electrons is 19. Hence, correct option is (a).
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