Question

प्रश्न 5. The Valency of the element
having atomic number 20 is
...... अणुअंक 20 असलेल्या
मूलद्रव्यांची संयुजा
आहे.
Oa)0
Ob)1
Oc)2
Od)​

Answer 1

Answer:

THE VALENCY OF CALCIUM IS 2 AND ITS ATOMIC NO. IS 20

Explanation:

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Answer 2

Answer:

2

Explanation:electronic configuration of atomic no 20 is 2,8,8,2

therefore valence electon in this case is 2 so

any atom having valence electron 4 or less than 4, then the number itself is the valency