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1.
Each element has many versions that contain a different number of neutrons in the nucleas. Each different version of the element is called an isotope.
Carbon-13 is and isotope of Carbon
door PrivateDonut 10 februari 2005
 
2.
Isotopes are atoms of the same element which have differing number of neutrons.

This means they have the same number of protons.
Deuterium is an isotope of hydrogen.
Deuterium is hydrogen-2, i.e. hydrogen with a mass number of 2 (1 proton + 1 neutron).

Tritium is a rarer isotope of hydrogen, and is also known as hydrogen-3 (it has 1 proton + 2 neutrons).
door ChemMan 12 mei 2010
 
3.
Lighter and heavier versions of the same thing, (but usually in reference to atoms)
Bud and Bud Lite are "isotopes" of Bud. When you gain weight, you just become an "isotope" of your former self.
door 387mqr 15 augustus 2008