Question

Short note on werner's theory of coordination compounds

Answer 1

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WERNER'S THEORY OF COORDINATION COMPOUND

Werner was able to explain the nature of bonding in complexes. The brief outlines of Werner's Theory are as : Metal shows two different kinds of valencies.

• Primary Valencies :- They are satisfied by anions and equal to the oxidation state of the metal.

• Secondary Valencies :- They are satisfied either by oppositely charged ions or neutral molecules and sometimes by cationic groups. Secondary valencies are equivalent to coordination number and they are directed in space in specific number around each central metal atom within the lattice.

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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.