a)What are polyatomic ions? Give one example each of polyatomic cation and anion.
b) What do you understand from the statement “relative atomic mass of sulphur is 32”?
c) What is meant by the term ‘chemical formula’?
a) A group of atoms carrying a charge is known as polyatomic ion, example of polyatomic cation: NH4+and polyatomic anion: NO3-.
b) It means an atom of sulphur is 32 times heavier than 1/12th the mass of 1 Carbon-12 atom.
c) Chemical formula represents the composition of a molecule of the substance in terms of the symbols of the elements present in the molecule.