Answer:
isotopes
Explanation:
The atoms of an element that have same number of protons but different number of neutrons are called as the isotopes of that element.
For example: [tex]_{1}^{1}(\textrm{H}\text{protium})\text{and}_{1}^{2}\textrm{H}(\text{deuterium})[/tex] are the isotopes of Hydrogen
Ions are the charged species of an atom that are formed by the gain or loose of electrons.
For example: [tex]\text{Na}^{+}[/tex]
Neutrons are the sub-atomic particles found inside the nucleus of an atom. They carry no charge.
Compounds are the substances that are formed when two or more atoms combine in a definite proportion.
For example: NaCl
