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Isotopes of atoms are atoms with the same number of protons and electrons but different number of neutrons. Adding neutrons to atoms does not affect charge, but it will affect atomic mass. This is why atomic mass is not reported as a whole number on the periodic table. Elements exist as a group of different isotopes.
출처: www.biologylessons.sdsu.edu/classes/lab2/glossary....
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Isotope - Atoms of like elements that have slightly different atomic weights because their nuclei contain a differing number of neutrons; eg O16 with a nucleus containing 8 protons and 8 neutrons and O18 with a nucleus containing 8 protons and 10 neutrons are two isotopes of oxygen.
출처: csd.unl.edu/general/glossary-letter.asp
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An isotope is a nuclide with the same atomic number but different atomic mass. Unstable radioactive isotopes are used for labeling in radioimmunoassays (RIA) and immunoradiometric assays (IRMA).
출처: www.brendan.com/Glossary.htm
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One of several varieties of an element that differ in the number of neutrons.
출처: www.earthscape.org/r3/erwin/glossary.html
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Different forms of atoms of the same element that have different numbers of neutrons in their nuclei. An element may have a number of isotopes. For example, the three isotopes of hydrogen are protium, deuterium, and tritium. All three have one proton in their nuclei, but deuterium also has one neutron, and tritium has two neutrons.
출처: www.uwsp.edu/cnr/wcee/keep/Mod1/Unitall/definition...
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