PO4^-3 is an ion.So its valency is -3
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To find the valency of a mixture or compound, you need to know the individual valencies of the elements involved. Valency is determined by the number of electrons an atom gains, loses, or shares to achieve a stable electron configuration. For example, in water (H2O), hydrogen has a valency of +1 and oxygen has a valency of -2, resulting in a compound with a total valency of zero.
by knowing the no. of electorns in its outermost shell
To determine the valency of an element, look at its position on the periodic table. Elements in group 1 have a valency of +1, those in group 2 have a valency of +2, group 17 elements have a valency of -1, and group 16 elements have a valency of -2. Transition metals may have variable valencies.
The most common charge (or valency) is -2. But there are compounds formed by elements of group VIA with valency from -2 to +6
The valency for plumbic is +4. This means that plumbic compounds typically have a charge of +4.