Question

Name the element which is in :
(a) first group and third period. (b) seventeenth group and second period.

Lakhmir Singh Chemistry Class 10

Answer 1

Hey !

Here is your answer !

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★ Sodium

★ Fluorine

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Answer 2

Given data Element belongs to 3rd period Therefore, n = 3 Element belongs to 17th group Therefore, number of valence electrons = 7 Outermost electronic configuration of element is 3s23p5 Therefore, the atomic number of element is