Question

Write the electronic configuration of an element whose atomic number

is 20.​

Answer 1

Answer:

The element A whose valency is 20 is Calcium and it's electronic configuration is 2,8,8,2 and element B whose valency is 17 is Chlorine and it's electronic configuration is 2,8,7. The compound formed when element A reacts with element B is Calcium Chloride.

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