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Using the perodic table, perdict the fo...

Using the perodic table, perdict the formulas of compounds which might be formed by the following pairs of elements : (a) silicon and bromine (b) aluminium and sulphur.

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Aluminium belongs to group 13 with a valency of 3, Sulphur belongs to group 16 with a valency of 2. Hence the formula of the compound formed would be `Al_2S_3`
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