1. Tardigrade
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  3. Chemistry
  4. The first ionization energy (in kj/mol) of Na, Mg, Al and Si respectively, are :

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Q. The first ionization energy (in kj/mol) of Na, Mg, Al and Si respectively, are :

JEE MainJEE Main 2020Classification of Elements and Periodicity in Properties

Solution:

Electronic configuration of $Na=\left[Ne\right]\,3s^{1}$
$Mg=\left[Ne\right]\,3s^{2}$
$Al=\left[Ne\right]\,3s^{2}3p^{1}$
$Si=\left[Ne\right]\,3s^{2}3p^{2}$
So order of first ionisation energy is
$\underset{496}{ Na }<\underset{737}{ Mg }>\underset{577}{ Al }<\underset{786}{ Si }\, kj / mol$
$Na < Al < Mg < Si \left( IE _1\right.$ order $)$