Question
1H1, 1H2 and 1H3, what is the mutual relation among them? In which of them, there is no neutron?
Answer
1H1, 1H2, and 1H3 are isotopes of hydrogen, meaning they have the same number of protons (1) but different numbers of neutrons (0, 1, and 2, respectively). 1H1 (hydrogen-1 or protium) is the only isotope of hydrogen that has no neutrons in its nucleus.