1. Tardigrade
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  3. Chemistry
  4. The first ionization energy of magnesium is smaller as compared to that of elements X and Y, but higher than that of Z. the elements X, Y and Z, respectively, are:

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Q. The first ionization energy of magnesium is smaller as compared to that of elements $X$ and $Y$, but higher than that of $Z$. the elements $X, Y$ and $Z$, respectively, are:

JEE MainJEE Main 2021Classification of Elements and Periodicity in Properties

Solution:

The $1^{\text {st }}$ IE order of $3^{\text {rd }}$ period is

$Na < Al < Mg < Si < S < P < Cl < Ar$

$X \,\& \,Y$ are $A r \,\& \,C l$

$Z$ is sodium $(Na)$.