Isotopes are defined as the variants of chemical elements that possess the same number of protons and electrons, but a different number of neutrons.
In other words, isotopes are known as variants of elements that differ in their nucleon i.e the total number of protons and neutrons.
Isotopes are also known to have the same atomic number and position in the periodic table and nearly identical chemical behavior but have different atomic masses and physical properties.
Tritium is an isotope of :
Tritium , is known as the isotope of Hydrogen, having an atomic weight of approximately 3.
Its nucleus mainly consists of one proton and two neutrons and has triple the mass of the nucleus of ordinary hydrogen.
Hydrogen has three main isotopes; protium, Deuterium , and Tritium ().
In these isotopes, the atomic number is the same as all isotopes i.e 1, which represents the number of protons or electrons of the isotopes, but they have different mass numbers or atomic masses that basically represent the number of neutrons present in these isotopes.
Hence, the element for which Tritium is an isotope is named as Hydrogen.