Calculate the effective atomic number of the metal atoms in the following complexes / complex ions.
`(A) [Cr(CO)_(6)]" "(b)[Fe(CN)_(6)]^(3-) " " (c )[Co(CN)_(6)]^(4-)" " [Ni(NH_(3))_(6)]^(2+)`
[Cr=24,Fe=26,Co=27 and Ni=28 as atomic numbers]

Answer

(a) 36 (b)35 ( c)37 (d) 38

Explanation

EAN= Number of electrons in meal atom or ion + Number of electrons donated by ligands to metal.
`(a) [Cr^(0)(CO)_(6)],EAN=24+12=36 ," "(b) [Fe^(III)(CN)_(6)]^(3-),EAN=23+12=35`
`( c) [Co^(II)(CN)_(6)]^(4-),EAN=25+12=37, " " (d) [Ni^(II)(NH_(3))_(6)]^(2+),EAN=26+12=38`