What is a central atom or ion?

explain with two examples each of the following coordination entity, central atom or ion ligands, coordination numbers , oxidation number of central atom, homoleptic and heteroleptic.

explain with two examples each of the following coordination entity, central atom or ion ligands, coordination numbers, coordination sphere, coordination polyhedron, oxidation number of central atom, homoleptic and heteroleptic.

Explain the following terms : central metal atom or ion

The hybridization of central atom ion [Ni(CN)_(4)]^(2-) is

Calculate the oxidation number of the central metal atom or ion for the following : (ii) [CoCl_(2)(en)_(2)]^(+)

Calculate the oxidation number of the central metal atom or ion for the following : (iii) [PtClNO_(2)(NH_(3))_(4)]^(2+) .

Calculate the oxidation number of the central metal atoms or ions : (any 4): (2) [PtClNO_(2)(NH_(3))_(4)]^(2+)