Question

what is the number of electrons with principal quantum number n=3 in Cr atom​

Answer 1

Answer:

17 electrons in n= 3 in Cr atom

Answer 2

Answer:

18

Explanation:

We know that,

no. of electrons=2n^2

Here n=3 (given)

Therefore,

no. of electrons= 2×(3)^2

=2×9

=18

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