Two atoms that differ only in the number of neutrons they contain are known as Isotopes.
What are isotopes?
Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei), location in the periodic table, and chemical element but have distinct nucleon numbers (mass numbers) as a result of having a different number of neutrons in their nuclei.
Although the chemical properties of each isotope of a given element are nearly identical, they differ in their atomic weights and physical characteristics. The atomic number, which is equal to the number of electrons in a neutral (non-ionized) atom, is the number of protons in the atom's nucleus.
Each atomic number designates a particular element, but not an isotope; the number of neutrons in an atom of a given element can vary widely.
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