Elements and Compounds — CHEMISTRY STD 7 — Question
ICSE BoardEnglish MediumSTD 7CHEMISTRYElements and Compounds4 Marks
Question
Write the difference between monoatomic ions and polyatomic ions with the help of examples.
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Answer
An ion that consists of only a single atom with a charge is called a simple ion or monoatomic ion. For example, a sodium ion $(Na^+)$ is a simple ion because it is formed from a single sodium ion. Magnesium ion $(Mg^{2+}),$ aluminium ion $(Al^{3+}),$ oxide ion $(O^{2-}),$ chloride ion $(Cl^–),$ etc are other monoatomic ions.
An ion that consists of a group of atoms with an overall charge $1$ is called a polyatomic or compound ion. For example ammonium ion $(NH^+_4)$ is a polyatomic ion which is made up of nitrogen and hydrogen with a positive charge. Carbonate ion $(CO_3^{2-}),$ hydroxide ion $(OH^–),$ etc are other polyatomic ions.
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