The atomic numbers of elements X, Y, Z a...

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

A

`Z gt Y gt X`

B

`X gt Y gt Z`

C

`Z gt X gt Y`

D

`Y gt Z gt X`

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The correct Answer is:

A

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