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Magnesium is an element of group 2 of th...

Magnesium is an element of group 2 of the periodic table. It forms compounds such as (i) magnesium oxide, MgO, (ii) magnesium hydroxide, `Mg(OH)_2`, (iii) magnesium sulphate, `MgSO_4` and (iv) magnesium chloride, `MgCl_2`. Calcium is also an element of group 2. Write the formulae of calcium oxide, calcium hydroxide, calcium sulphate and calcium chloride.

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The elements of the same group form compounds of similar formulae. Thus
(i) Calcium oxide CaO, (ii) calcium hydroxide, `Ca(OH)_2`, (iii) calcium sulphate, `CaSO_4`, (iv) calcium chloride, `CaCl_2`.
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