1. Tardigrade
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  3. Chemistry
  4. Predict the formula of a compound formed by aluminium and sulphur.

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Q. Predict the formula of a compound formed by aluminium and sulphur.

Classification of Elements and Periodicity in Properties

Solution:

$Al - 3e^- \to Al^{3+}$, $S + 2e^- \to S^{2-}$
The formula for its sulphide is $Al_2S_3$