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Question

The electronic configuration of the following elements K19, Mn25, Ca20 are given.

K19 = 1s2 2s2 2p6 3s2 3p6 4sx
Mn25 = 1s2 2s2 2p6 3s2 3p6 3d5 4sy
Ca20 = 1s2 2s2 2p6 3s2 3p6 4sz

The product of x, y, and z is:

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Solution

The electronic configurations of elements are as given below.

K19 = 1s2 2s2 2p6 3s2 3p6 4s1

Hence, x=1.

Mn25 = 1s2 2s2 2p6 3s2 3p6 3d5 4s2

So, y=2.

Ca20 = 1s2 2s2 2p6 3s2 3p6 4s2

Hence, z=2

Then the product of x, y and z is 1×2×2=4

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