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
