what do u mean by "primary valency is ionisable" - Chemistry - Coordination Compounds

Question

what do u mean by "primary valency is ionisable"??

Arti Gujrati · Accepted Answer

In coordination compounds, There are two types of valences, primary
and secondary

primary valence is the number of negative ions which are required
to satisfy the charge on the metal ion and it is written outside
the coordination sphere Primary valency is ionisable while
secondary valence are those which satisfy the coordination number
of central metal ion and it is written in coordination
sphere

Take an example :

[Cr(H 2
O)
6
]Cl
3
Here 3 chlorine atoms are outside the coordination sphere in form
of 3Cl- If the complex is ionized it will furnish
Cl- as anion and

Cr(H 2
O)
6
]+3
as cation which shows primary valency
is ionisable