Question

Define primary and secondary valency of metal ions proposed by werner theory?

Answer 1

According to Werners theory each coordinate complex compound exhibits two types of valencies.The are a) primary valency and b) secondary valency. Primary valencies are satisfied by only negative charge and it is equal to oxidation state of central metal ion.

Secondary valencies are satisfied by either negative charge or neutral species and it is equal to the coordinate number. Primary valencies are denoted by dotted lines and ionisible. Secondary valenices are denoted by dark or straight lines and non ionisible.