Question

The period with electrons in the shells K, L and M.

Answer 1

period =3 {because there are 3 shells}

Answer 2

Number of electrons = 2n^2

here, n = no. of shells

The first Shell K = 2n^2 = 2(1)^2 = 2×1 = 2

therefore first shell contains 2 number of electrons

The second Shell L = 2n^2 = 2(2)^2 = 2×4 = 8

therefore second shell contains 8 number of electrons

The third Shell M = 2n^2 = 2(3)^2 = 2×9 = 18

therefore third shell contains 18 number of  electrons

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