First slide

Periodicity in atomic properties

Question

Which one of the following has the largest ionisation energy.

Moderate

A

$_{11} Na$
B

$_{19} K$
C

$_{12} Mg$
D

$_{37} Rb$

Solution

Group 2 elements (e.g. Mg) have high IE than group I element (e.g. Na, K and Rb). In simple words Mg have full filled orbital.

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