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The ionization energy for 'Se', 'Y' and 'La' are x, y and z kcal/mol respectively. Choose the correct relationship between them.

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$\begin{aligned} z > x = y \end{aligned}$

$x > z = y$

$\begin{aligned} x > y > z \end{aligned}$

$x < y > z$

answer is B.

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Detailed Solution

The ionization energy for Selenium,Yttrium,Lanthanum are x, y and z kcal/mol respectively. The correct relationship between them is $\begin{aligned} x > y > z \end{aligned}$ .

A high ionization energy value indicates that the electron and nucleus are attracted to one another strongly.

The electron and nucleus of selenium is attracted to one another strongly due to which the ionization energy for Selenium is greatest.

Hence the correct order for the ionization energy $\begin{aligned} x > y > z \end{aligned}$ .

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