The formula of sodium sulphate is Na2SO4.
(a) Name the elements present in it.
(b) Write the number of different atoms present in one molecule of this compound.
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Solution
(a) The elements present in sodium sulphate are Na (sodium), S (sulphur) and O (oxygen).
(b) One molecule of this compound contains two atoms of sodium, one atom of sulphur and four atoms of oxygen.