- Valency of ion is equal to the charge of the ions.
- Cations carry positive charge whereas Anions carry negative charge.
- When the valency is 1 for cations, they are called as Monovalent Cations.
- When the valency is 2 for the cations, they are called as divalent cations.
- When valency is 3 for the cations, they are called as Trivalent Cations.
|MONOVALENT CATIONS||DIVALENT CATIONS||TRIVALENT CATIONS|
|Hydrogen ion, H⁺||Barium ion, Ba²⁺||Aluminium Ion, Al³⁺|
|Potassium ion, K⁺||Calcium ion, Ca²⁺||Iron ion, Fe³⁺|
As anions have negative charge, the valency will be called as monovalent anion (1 ˉ), divalent anion (2ˉ) and trivalent anion as (3ˉ)
|MONOVALENT ANION||DIVALENT ANION||TRIVALENT ANION|
|Bromide ion, Brˉ||Sulphide ion, S²ˉ||Phosphide ion, P³ˉ|
|Nitrate ion, NO3ˉ||Sulphate ion, SO4²ˉ||Phosphate ion, PO4³ˉ|
To write the formula of a compound, following points need to be understood,
- Write the symbol of the element.
- Write the valency of the element below the symbol.
- Make a cross over the valency and the symbol & thus the desired formula will be the result.
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