Does the atomic number of an elment changes when its atoms form ions ? Give reason of your answer.

• No, the atomic number of an element does not change when it forms ion.
• In an isolated neutral atom, total number of protons is equal to total number of electrons revolving around the nucleus.
• Atomic number = Total number of protons in the nucleus.
• When an atom forms an ion by loss or gain of electrons, the number of electrons revolving around the nucleus changes.
• But the total number of protons remains the same.
• Hence, the atomic number of the element does not changes when it forms ion.