1. Tardigrade
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  3. Chemistry
  4. The atomic numbers of elements X, Y and Z are 19,21 and 25 respectively. The number of electrons present in the M shells of these elements follow the order.

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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 shells of these elements follow the order.

Structure of Atom

Solution:

${ }_{19} X \rightarrow 1 s^{2} 2 s^{2} 2 p^{6} \underline{3 s^{2} 3 p^{6}} 4 s^{1}$

${ }_{21} Y \rightarrow 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} \underline{3 d^{1}}$

${ }_{25} Z \rightarrow 1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 4 s^{2} \underline{3 d^{5}}$

$Z>Y>X$