![]() While all isotopes of a given element have almost the same chemical properties, they have different atomic masses and physical properties. They have the same atomic number (number of protons in their nuclei) and position in the periodic table (and hence belong to the same chemical element), but differ in nucleon numbers ( mass numbers) due to different numbers of neutrons in their nuclei. Isotopes are distinct nuclear species (or nuclides, as technical term) of the same chemical element. From left to right, the isotopes are protium ( 1H) with zero neutrons, deuterium ( 2H) with one neutron, and tritium ( 3H) with two neutrons. The fact that each isotope has one proton makes them all variants of hydrogen: the identity of the isotope is given by the number of protons and neutrons. 1999‑2023 - All Rights Reserved.The three naturally occurring isotopes of hydrogen. Retrieved from Ĭopyright © Israel Science and Technology Directory. "Sortable list of elements of the Periodic Table".
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