There are three isotopes of hydrogen atom, namely Protium, Deuterium and Tritium. The respective atomic number and mass number of the isotope Tritium is:

Correct option is D

The correct answer is (d) 1, 3.
Explanation:
· Isotopes of Hydrogen:
· Protium: Atomic number = 1, Mass number = 1
· Deuterium: Atomic number = 1, Mass number = 2
· Tritium: Atomic number = 1, Mass number = 3
· Tritium:
· Tritium is the heaviest isotope of hydrogen.
· It has 1 proton, 2 neutrons, and 1 electron.
· Atomic number: The number of protons = 1 (same for all hydrogen isotopes).
· Mass number: The total number of protons and neutrons = 3.