Some widespread valencies it is best to keep in mind are:- Tips on how to calculate the charge on monatomic ions using the periodic desk. For instance, Groups I, II and III would have a cost of +1, +2 and +3 respectively, whereas Teams V, VI and VII would have a charge of -three, -2 and -1 respectively. – Transition metals have an oxidation state of +2 more often than not. Know the exceptions (discussed in subsequent level)- Widespread exceptions to transition metals having a +2 oxidatoin state are: Iron (will be iron(II) or iron(III)), copper (can be copper(I) or copper(II)) and silver (virtually always +1 solely, as silver(I)).- All the frequent polyatomic anions (carbonate, sulfate, nitrate are the three which are most commonly referred to throughout the course)
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