Question

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

Answer 1

Hey here is your answer
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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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Answer 2

Answer:

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