Q. The set representing the correct order of ionic radius is
A) $Li^{+} > Be^{2 +} > Na^{+} > Mg^{2 +}$
B) $Na^{+} > Li^{+} > Mg^{2 +} > Be^{2 +}$
C) $Li^{2 +} > Na^{+} > Mg^{2 +} > Be^{2 +}$
D) $Mg^{2 +} > Be^{2 +} > Li^{+} > Na^{+}$
Explanation
(b)
The ionic radius in general increase moving top to bottom and further decreases moving left to right. So, the correct order is :
${Na}^{+} > \ \ \ \ {Li}^{+} > \ \ {Mg}^{2 +} > {Be}^{2 +}$
0.95Å 0.68 Å 0.65 Å
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.