Question

write the postulate of werners theory of coordination​

Answer 1

• All elemnts have two types of valency:

1 primary valency : oxidation no.

2 secondary valency : coordination no.

• All elements have tendency to satisfy both of these values

primary valencies are satisfied during chemical bond formation (complete its covalency)

    Cu²+ + So₄²-  will gives you CuSo₄   and here Cu satisfy the primary valency...

secondary valencies are satisfied by coordination bond formation . By accepting lone pair of electron.

• the species attached to primary valency have no fix position in space they adjust themselves in such a way that they posses minimum repulsion .
• the speices attached to sec valency have fix position...

hope this will help you...

Answer 2

Answer:

( a ) A metal shows two kinds of valencies viz primary valency and secondary valency.Negative ionssatisfy primary valenciesand secondaryvalencies are filled by bothneutral ions  and negative ions.

( b ) A metal ion has a fixed  amount of secondary valencies about the central atom. These valenciesalso orient themselves in a particular  direction in the space provided to the definite geometry of the coordination compound.

( c ) Secondary valencies cannot be ionized , while primary valencies can usually be ionized.