The first ionization energy of magnesium is smaller

Question:

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

  1. chlorine, lithium and sodium

  2. argon, lithium and sodium

  3. argon, chlorine and sodium

  4. neon, sodium and chlorine

Correct Option: , 3

Solution:

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

$\mathrm{Na}<\mathrm{Al}<\mathrm{Mg}<\mathrm{Si}<\mathrm{S}<\mathrm{P}<\mathrm{Cl}<\mathrm{Ar}$

$\mathrm{X} \& \mathrm{Y}$ are $\mathrm{Ar} \& \mathrm{Cl}$

$Z$ is sodium (Na).

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