Question

what are ions explain with suitable examples

Answer 1

An ion is defined as an atom or molecule which has gained or lost one or more of its valence electrons, giving it a net positive or negative electrical charge. In other words, there is an imbalance in the number of protons (positively charged particles) and electrons (negatively charged particles) in a chemical species.
Examples:alpha particle He2+, hydroxide OH-

Answer 2

ions are of 2 type
1- cation - means positive charge
eg : Na
2- anion- means negative charge
eg : cl
and they together are known as ionic compound