Question

# In the metal carbonyls of the general formula $$M{ \left( CO \right) }_{ x }$$ where M = metal, x = 4, EAN rule satisfied for atomic number of M equal to :

A
25
B
26
C
27
D
28

Solution

## The correct option is D 28EAN rule:- The total number of $$e^-s$$ linked with the central metal atom or ion in a complex plus the $$e^-s$$ donated by the ligand is known as Effective Atomic Number, i.e; $$EAN$$. It is the attainment of noble gas configuration. $$EAN=Z-x+2nL$$ $$Z$$= atomic number of the metal in the complex ion. $$x$$= oxidation state of the central metal atom. $$n$$= no. of ligands. $$L$$= no. of coordinate bond formed by the ligand. EAN rule:- The total number of $$e^-s$$ linked with the central metal atom or ion in a complex plus the $$e^-s$$ donated by the ligand is known as Effective Atomic Number, i.e; $$EAN$$. It is the attainment of noble gas configuration. $$EAN=Z-x+2nL$$ $$Z$$= atomic number of the metal in the complex ion. $$x$$= oxidation state of the central metal atom. $$n$$= no. of ligands. $$L$$= no. of coordinate bond formed by the ligand.  $$M(CO)_4$$EAN$$\Rightarrow36=z-0+2\times (4)(1)$$ $$[\because$$ EAN rule is satisfied$$]$$$$z=36-8$$$$\Rightarrow 28$$.$$\therefore$$ Atomic number of $$M=28$$.Chemistry

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