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/ˈaɪ.sə.təʊp/ · noun
(nuclear physics) Any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei. Thus, isotopes have the same atomic number but a different mass number..
Use isotope when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Isotope means (nuclear physics) Any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei. Thus, isotopes have the same atomic number but a different mass number..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use isotope where its definition matches the intended context.
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