Question 9) In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties rese

Question 9) In the Modern Periodic Table, calcium (atomic number 20) is surrounded by elements with atomic numbers 12, 19, 21 and 38. Which of these have physical and chemical properties rese- Hosting Precise

Posted on 3rd Sep 2021 00:34:01 in

Ans:

Elements with atomic number 12 and 38 have physical and chemical properties same as calcium as they all belong to same group i.e. second group.

Electronic configuration of Calcium (20) = 2, 8, 8, 2

valence electrons = 2, Group they belong = second

Electronic configuration of element having atomic number 12 = 2, 8, 2

valence electrons = 2, Group = Second

Electronic configuration of element with atomic number 19 = 2, 8, 8, 1

Valence electron = 1, Group = First

Electronic configuration of element with atomic number 21 = 2, 8, 8, 3

Valence electron = 3, Group = Third

Electronic configuration of element having atomic number 38 = [Kr], 2

Valence electron = 2, Group = Second

Since, elements having atomic number 12 and 38 belong to same group i.e. second same as calcium, therefore they all have similar physical and chemical properties.

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