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isotope

i·so·tope [ ssə tp ] (plural i·so·topes)


noun 
Definition:
 
form of element with same atomic number: each of two or more forms of a chemical element with the same atomic number but different numbers of neutrons

[Early 20th century. <iso- + Greek topos "place"; because isotopes of the same name occupy the same place in the periodic table]

i·so·top·ic [ ssə tóppik ] adjective
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