Question
Chemistry Question on Classification of elements & periodicity in properties
Which one of the following ions will be smallest in size?
A
Na+
B
Mg2+
C
F−
D
O2−
Answer
Mg2+
Explanation
Solution
Na+,Mg2+,O2−andF− all are isoelectronic but Mg2+ have 12 protons in his nucleus, so the attraction force on last shell is maximum and hence it have smallest size.