Stable isotopes can be used by measuring their amounts and proportions in samples, for example in water samples. Naturally-occurring stable isotopes of water and other substances are used to trace the ...

and all three isotopes have one electron in their atoms. An isotope is named after the element and the mass number of its atoms. For example, carbon-12 is an isotope of carbon with a mass number ...

Explain with examples that isotopes have the same number of electrons and protons, it is the number of neutrons that changes.

and the time it takes for one-half of a particular isotope to decay is its radioactive half-life. For example, about 1.5 percent of a quantity of Uranium 238 will decay to lead every 100 million ...

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 ...