Question

1 point
6.An element has atomic
number 20 and in group 2 and
period 4. Which option gives
the number of valence
electrons and shells present in
the element? *
3 and 8
4 and 2
O2 and 4
O 3 and 2​

Answer 1

Answer:

option c is the correct answer.

2 and 4

Explanation:

number of valence electron = 2

4S2 sub-shell , so sub-shell is 4s

and it is Ca (calcium)

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Answer 2

Answer:

4 and 2 are correct answer