What is primary and secondary valency in coordination compounds?

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Solution

$\begin{matrix} P r i m a r y V a l e n c y & S e c o n d a r y V a l e n c y P r i m a r y v a l e n c y m a y b e d e f i n e d a s + v e & S e c o n d a r y v a l e n c y m a y b e d e f i n e d a s c h a r g e r a i s e d o v e r c e n t r a l & n o o f m o n o d e n a t e o r e q u i v a l e n t t o m e t a l i o n a s i t s o x i d a t i o n s t a t e & m o n d e n t a t e l i g a n d a t t a c h e d t o c e n t r a l m e t a l i o n . I t d e f i n e s t h e c o o r d i n a t i o n N o . I t i s i o n i s a b l e a n d v a r i a b l e & I t i s n o n i o n i s a b l e a n d f i x e d \end{matrix}$
Example: $[C r (H_{2} O)_{6}] C l_{3}$ =Primary valency is satisfied by Chloride ion and is equal to 3
Secondary valency is satisified by $H_{2} O$ moleucles and is equal to 6.

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