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When the ionisation energy v/s atomic number is plotted for the elements, of atomic number 11 to 18 , two peaks are observed for the element $X$ and $Y$ in between the curve. What is the difference between atomic number of element $X$ and element $Y$ ?

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answer is 3.

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Detailed Solution

$\to$ Peak is observed at $Mg (At . No = 12)$ and $P (At . No = 15)$ .

It is because ' $M g$ ' has completely filled orbitals and 'P' has half-filled orbitals.

So, the difference between Atomic number of $X$ and $Y$ is $| 12 - 15 | = | 3 |$

Hence, the required answer is 3.

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