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Groups in Modern Periodic Table

write formula...

Question

write formula for the following compounds using valency.
a)coppersulphate
b)calcium chloride

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Solution

a. Copper has a valency of 2.
It is a metal and thus forms a cation by losing two electrons, Cu²⁺.
Sulphate is an polyanion with a valency of 2.
Formula of compound = CuSO_4

b. Copper has a valency of 2.
It is a metal and thus forms a cation by losing two electrons, Cu²⁺.
Cl forms an anion by gaining one electron.
Formula of compound = CuCl₂

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Groups in Modern Periodic Table

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