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Question

A. What is a chemical symbol of an element? What information does it convey?
B.
Write the chemical formula of the sulphates of Aluminium, Ammonium and Zinc.

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Solution

A.

A chemical symbol is the short form which stands for an atom of a specific element or the abbreviations used for the names of elements.

  • It represents a specific element.

  • It represents one atom of an element.

  • A symbol represents how many atoms are present in one gram (gm) atom.

  • The chemical symbol of an element represents the mass of an atom of that element.

    B.

    Valencies of aluminium, ammonium and zinc are 3, 1 and 2, respectively.

    The valency of sulphate is 2.

    Hence, chemical formulae of the sulphates of aluminium, ammonium and zinc are Al2(SO4)3,(NH4)2SO4 and ZnSO4.


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