There are three isotopes of hydrogen: hydrogen ... They have the same mass number, A, but different atomic number, Z, and different chemical symbol - they are not the same element.

While the number of protons defines the element (e.g., hydrogen, carbon, etc.) and the sum of the protons and neutrons gives the atomic mass, the number of neutrons defines the isotope of that element ...

This Section implements all activities of the IAEA's Water Resources Programme, which promotes and transfers know-how on the use of isotope hydrology as an effective ... the naturally-occurring ...

While deuterium H-2, an isotope twice as heavy as hydrogen, is predominantly used in nutrition research, nitrogen-15 is the most common stable isotope used in agriculture. Many other stable isotopes ...

There are three isotopes of hydrogen: hydrogen ... They have the same mass number, A, but different atomic number, Z, and different chemical symbol - they are not the same element.