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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
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B
26
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C
27
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D
28
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Solution

The correct option is D 28

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.

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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