Question
Chemistry Question on Classification of elements & periodicity in properties
From the following pairs of ions which one is not an iso-electronic pair?
A
Fe2+, Mn2+
B
O2−, F−
C
Na+, Mg2+
D
Mn2+, Fe3+
Answer
Fe2+, Mn2+
Explanation
Solution
The correct answer is option (A) : Fe2+, Mn2+