What is a central atom or ion?...

What is a central atom or ion?

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(i) The central atom or ion is the one that occupies the central position in a coordination entity and binds other atoms or group of atoms (ligands) to itself through a coordinate covalent bond.
(ii).For example ,in ` K_4 [Fe(CN)_6],` the central metal ion is `Fe^(2+) ` In the coordination entity ` [Fe(CN)_6]^(4-) ` the ` Fe^(2+) ` accepts electron pair from each ligand ` CN^(-) ` and thereby forming six coordinate covelent bonds with them.
(iii) It is referred to as a Lewis acid.

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Hybridisation of central atom in PCI_(5) involves the mixing of orbitals.

`s,p_(x),p_(y),d_(x2),d_(x2-y2)`

`s,p_(x).p_(y),p_(xy).d_(x2-y2)`

`s,p_(x),p_(y),p_(z),d_(x2-y2)`

`s,p_(x),p_(y),d_(xy),d_(x2-y2)`

Hybrisation of central atom in PCI_(5) involves the mixing of orbitals :

`s,p_(x),p_(y) ,d_(x)^(2) . D_(x^2-y^(2))`

`s,p_(x) ,P_(y),P_(xy),d_(x^2-y^(2))`

`s, p_(x ) , p_(Y ) , p_(X) , d_(x^2-y^2)`

`s,p_(x),p_(y) , d_(xy) , d_(x^2 - y^2)`

Hybridisation of central atom in PCl_(5) involves the mixing of orbitals.

`s, p_(x), p_(y), d_(z^(2)), d_(x^(2)-y^(2))`

`s,p_(x).p_(y),p_(xy).d_(x^(2)-y^(2))`

`s,p_(x),p_(y),p_(z),d_(z^(2))`

`s,p_(x),p_(y),d_(xy),d_(z^(2))`