5. Give an example of a polyatomic cation.
4 Which is used as a standard to compare the atomic masses of different elements?
6. Give the names of the elements represented by the symbols Hg and Pb.
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5. Sulphur, phosphorus etc.
4. mass of neutrons and protons is considered to be standard unit for comparing different elements.
6. Hg is Mercury and Pb is lead.
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