Chemistry · 2021
JEE Main · 16 March 2021, Shift 2 · Q36
Identify the elements X and Y using the ionisation energy values given below: Ionization energy (kJ/mol)
Identify the elements X and Y using the ionisation energy values given below :Ionization energy (kJ/mol)
| $\displaystyle 1^{\text {st }}$ | $\displaystyle 2^{\text {nd }}$ | |
| X | $\displaystyle 495$ | $\displaystyle 4563$ |
| Y | $\displaystyle 731$ | $\displaystyle 1450$ |
Official answer
(1)
$\displaystyle \mathrm{X}=\mathrm{Na} ; \mathrm{Y}=\mathrm{Mg}$
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