ChemistryInorganic: Coordination Compounds

What is the Effective atomic number of Fe in Fe2(CO)9?

What is the Effective atomic number of Fe in Fe₂(CO)₉?

Answer & explanation

Correct answer: option 1

Effective Atomic Number $=$ Atomic number of central atoms $-$ (oxidation no. of central atom) $+$ No. of electron taken from Ligands.

Atomic No. of

F e = 26

and

^{'} C O^{'}

is a neutral ligand. So, oxidation no. of central atom

= 0

The

3

terminal bonds for each

^{'} F e^{'}

2

electrons each while the middle common bonds share

1

electron.

Total shared electrons

= 3 \times 2 + 3 = 9

Now,

E A N = 26 - 0 + 9 = 35