Atoms and molecules
12. An ion is a charged particle and can be negatively or positively charged
13. A negatively charged ion is called an ‘anion’
17.A positively charged ion is called ‘cation’
18.Ions may consist of a single charged atom or a group of atoms that have a net charge on them
19.Ionic compounds contain charged species called ions as their smallest unit
20.A group of atoms carrying a fixed charge on them are called polyatomic ions or radicals
21. The chemical formula of a compound is a symbolic representation of its composition
22. Valency is the combining capacity of an element
23.Valency can be used to find out how the atoms of an element will combine with the atom(s) of another element to form a chemical compound
24.Names and symbols of some ions
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NCERT 9 Science