Question

EAN of $Fe$in ${K_4}[Fe{(CN)_6}]$ is:
(A) $30$
(B) $34$
(C) $36$
(D) $35$

Answer 1

Hint: Effective atomic number, the number that represents the sum of the number of electrons around the nucleus of an atom in a metal compound. It is made up of metal atoms and bonding electrons from atoms and atoms that supply the surrounding.

Complete Step by Step Solution:
The total number of electrons around the central metal ion is present in the complex and is calculated as the sum of the electrons in the metal ion and the number of electrons given to the ligands. It can be calculated using a formula, EAN $ = Z - X + Y$
Where $Z$ is the atomic number of metal.
$X = $Number of electrons lost during the formation of metal ions from its atom.
$Y = $Number of electrons donated by ligands.
${K_4}[Fe{(CN)_6}$, atomic number of $Fe$is $26$
Oxidation number $ = 4 + X - 6 = 0$
Coordination number $2 \times 6 = 12$
Therefore, EAN $ = 26 - (2 \times 12) = 36$
So, the correct answer is C) $36$

Additional information: The number of metal compounds The metal atom tends to surround itself with enough ligands to make the active atomic number equal to the number and atomic number of a high-quality gas element found at the same time as the metal is present. This law seems to hold too many metal problems containing carbon monoxide, carbonyl iron, and many organometallic compounds. By applying this rule, it is possible to predict the number of ligands in these types of compounds and their reaction products.

Note: Effective atomic numbers are calculated by the atomic metal atoms of the composite compounds. They provide information about structural stability and help to understand that complex compounds have reducing or oxidising properties.