The resulting chemical formulae are Mg3N2, Li3N, Na2S and Al2O3. In each compound, the combining valencies of the metal and non-metal elements are criss-crossed to establish an electrically neutral ionic substance.
Write the formulae for the compounds formed by the reaction of: (i) Magnesium and nitrogen (ii) Lithium and nitrogen (iii) Sodium and sulfur (iv) Aluminium and oxygen
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For magnesium and nitrogen, magnesium has a valency of 2 and nitrogen has a valency of 3, yielding magnesium nitride Mg3N2. Lithium has valency 1 and nitrogen has 3, giving lithium nitride Li3N. Sodium has valency 1 and sulfur has 2, forming sodium sulfide Na2S. Aluminium has valency 3 and oxygen has 2, producing aluminium oxide Al2O3. All formulae represent charge-balanced compounds.
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