and the sum of the protons and neutrons gives the atomic mass, the number of neutrons defines the isotope of that element. For example, most carbon (≈ 99 %) has 6 protons and 6 neutrons and is written ...

Chlorine naturally exists as two isotopes ... 75 atoms have a mass number of 35, and 25 atoms have a mass number of 37. To calculate the relative atomic mass, A r, of chlorine: \(\textit ...

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Isotope hydrology helps governments find and understand the source of their water supplies – so they can develop management ...

Atomic structure Atoms are made from protons ... The mole and concentration of solutions The gram formula mass of a substance is known as the mass of one mole. The mass, number of moles ...