The atomic numbers of elements X, Y and Z are 19,21 and 25 respectively. The number of electrons present in the M-shell of these elements follow the order

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Z>X>Y

X>Y>Z

Z>Y>X

Y>Z>X

answer is C.

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Detailed Solution

Symbols =KLMNX 19 =2881Y 21 =2892Z 25 =28132Hence, the order of number of electrons in M shell is Z>Y > X.

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