Isotopes are defined as atoms of the same element but differ in the number of neutrons in their nucleus where a number of protons and electrons remain the same.
Ions are defined as chemical species of an atom with an electrical charge.IO with a positive charge are called cations, and ions with a negative charge are called anions.
Atom has three subatomic particles: protons, electrons, neutrons
Atomic number (Z)= Number of protons
Number proton = Number of electrons (isoelectric neutral atom)
Atomic mass (A)= Number of protons + Number of neutrons
The chemical symbol of an element X is written as:[tex]^A_ZX^C[/tex]
Where : Charge on ion = C
Learn more about atomic mass and the atomic number here:
