The atomic numbers of elements \( X, Y \) and \( Z \) are 19,21 and...

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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
(a) \( ZXY \)
(b) \( XYZ \)
(c) \( ZYX \)
(d) \( YZX \)
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