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Question
Q416) Consider the following ions
1. Ni
2+
2. Co
2+
3. Cr
2+
4. Fe
3+
Atomic number Cr=24, Fe - 16, Co=27, Ni=28
The correct sequence of the increasing order of the number of unpaired electrons is ....
a) 1, 2, 3, 4
b) 4, 2, 3, 1
c) 1, 3, 2, 4
d) 3, 4, 2, 1
SOLUTION
Un paired electrons in
Ni
2+
=2
Co
2+
=3
Cr
2+
=4
Fe
3+
=5
Answer: (a)