Question

<!--td {border: 1px solid #ccc;}br {mso-data-placement:same-cell;}--> The first ionization energy (in kJ/mol) of $Na,Mg,Al$ and $Si$ respectively are :

JEE MAIN - 2020

• A. $496,577,786,737$
• B. $496,577,737,786$
• C. $786,737,577,496$
• D. $496,737,577,786$

Answer 1

The correct option is D $496,737,577,786$

The first ionization energy increases increases along the period due to increase in effective nuclear charge. The correct order is
$Na<Mg>Al<Si$
Mg has higher ionization energy than Al due to fully filled configuration.
Correct option is (d).