Calcium Sulphate is called a compound. Justify the statement in at least three points.
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Answer:
hey there,
The formula for calcium sulphate is CaSO4.
It is called an ionic compound as there is an exchange of electrons between two a polyatomic ion (SO4) and the element Calcium.
Ionic compounds contains ions which are basically charged particles. Thus due to the bond formed by these charged particles create an ionic bond.
The bond is created by loosing or gaining electrons.
Now, the case of calcium sulphate - Calcium has a valency of +2, while sulphate has a charge of - 2.
This means that calcium can give away 2 electrons to sulphate, and that way both elements achieve stability and form a compound, or an ionic compound.
So how did we find out the valency? It's simple we just have to look at the electronic configuration of calcium.
So calcium has 20 electrons in total.
This it's electronic configuration is 2,8,8,2.
Since there are 2 electrons remaining in the valence or outer shell, it's valency is 2.
As for sulphate, SO 4
THE NET CHARGE IS - 2.
THE CHARGE OF SULPHUR ION CAN BE +6 OR - 2 AGAIN BY LOOKING AT ITS ELECTRONIC CONFIGURATION. BUT WE NEED TO CONSIDER THE CHARGE +6 AS THERE ARE FOUR ATOMS OF OXYGEN INVOLVED.
THE NET CHARGE FOR THE OXYGEN WILL BE - 8
THE CHARGE FOR SULPHUR WILL BE +6
ADDING BOTH WE HAVE - 2