Sidgwick's Electronic Concept

Q. In $K_4\left[Fe\right(CN{)}_6]$, the EAN of Fe is

1. 18
2. 54
3. 36
4. 26

Q.

The effective atomic number of central Cu (At. No. 29) metal in $\left[Cu\right(N{H}_3{)}_4]S{O}_4$ is

1. 29

2. 30

3. 35

4. 36