Question

a) Which of the following species will have the largest and smallest size?
Mg, Mg²⁺, AI, AI^3+, Na, Na^+, Li, Li⁺
will na have largest and li+ have smallest size

Answer 1

Dear Annette Elsa,

From top to bottom size increases while in left to right size decreases.
When +ve charge increases size decreases while when -ve charge increases the size.

So Na will have largest size (90 pm) while Al³⁺ will have smallest size (67.5 pm)
3 +ve charge is present in Al so size will reduce more as compared to Li⁺ or Mg²⁺
Even Mg²⁺(85 pm) has smaller radius than Li^+.

Regards