Give the coordination number of `Fe` in `[Fe(EDTA)]^(-)`.

Explanation

The molecular formula of EDTA is given by :
`(.^(-)"OOCCH"_(2))_(2)overset(..)N-CH_(2)-CH_(2)-overset(..)N(CH_(2)COO^(-))_(2)`
In the above complex, the number of donor atoms = 6
(i.e., two N - atoms and four negatively charged O - atoms)
`therefore " The coordination number of Fe = 6."`