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Q.

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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a

Z>X>Y

b

X>Y>Z

c

Z>Y>X

d

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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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