Class 9 Chemistry Atoms and Molecules Ions


Metals and non-metals leads to the formation of Compounds that possess charged species. These charged species are called ions.

These charged species can be either positively charged called cation or negatively charged called anion. For instance, In sodium chloride (NaCl), Na exist as cation Na+ whereas Cl exist as anion Cl-.


They can be further classified into following two types:

Ions possessing only one atom are termed as monoatomic ions. For instance, Na+, K+ etc.

Ions possessing more than one atom are termed as polyatomic ions. For example, CO32-, NO3- etc.

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