How to find out the valency of hydrogen sulphide.
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valency of sulphur in H2S is -2,valency of sulphur in SO2 is -2,valency in SO3 is -2. +3.
The sulphur atom has 6 electrons in the outermost shell, and its valency could be 6. But it is easier for sulphur to gain two electrons instead of losing six electrons. Hence, its valency is determined by subtracting six electrons from the octet and this gives a valency of two for sulphur.
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Hydrogen's valency is +1 and sulphur's valency is -2. So we know that we need +2 so that we can make -2 zero. So if we will take two hydrogen then the total valency of hydrogen atoms will be +2 which will cancel -2 of sulphur and make it zero.
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