Question

The EAN of metal atom in Fe(Co)2 (NO)2 is? Please explain how?

Answer 1

The EAN of the metal atom in [Fe(CO)(NO)₂] is 36.

• Effective atomic number refers to the number of electrons surrounding the metal atom in a metal complex.
• In the given compound, NO is in +1 oxidation state.
• Therefore, oxidation number of Fe can be calculated as:

              x + 0 + 2 = 0

                   x = -2

• EAN = 26 + 2*2 + 3*2 = 36

Answer 2

EAN of metal atom Fe=30

Explanation:

EAN: It is defined as the total number of electrons surrounding the nucleus of metal atom in metal complex.

It can be easily calculated  by the formula

$EAN=Z-ON+CN$

Where Z=Atomic number of central metal atom

ON=Oxidation number of central metal atom

CN=Coordination number of central metal atom

$[Fe(CO)(NO)_2]$

Atomic number of Fe=26

Charge on CO=0

Charge on NO=-1

To find oxidation number of Fe

$x+0+2(-1)=0$

$x-2=0$

$x=2$

Oxidation state of Fe=II

Electrons on Fe(0) atom=26

Electrons on Fe(II) ion=26-2=24

Electrons donated by CO=$2\times 1=2$

Electrons donated by 2(NO)=$2\times 2=4$

Therefore, EAN of metal atom Fe=$26-2+2+4=30$

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