Question

How is the isotope of hydrogen different from the non isotopic form of hydrogen?​

Answer 1

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They each have one single proton (Z = 1), but differ in the number of their neutrons. Hydrogen has no neutron, deuterium has one, and tritium has two neutrons. The isotopes of hydrogen have, respectively, mass numbers of one, two, and three.

Answer 2

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Of these, ⁵H is the most stable, and ⁷H is the least. Hydrogen is the only element whose isotopes have different names in common use today: the ²H (or hydrogen-2) isotope is deuterium and the ³H (or hydrogen-3) isotope is tritium. ... The ordinary isotope of hydrogen, with no neutrons, is sometimes called protium.