noun \ˈī-sə-ˌtōp\

Definition of ISOTOPE

: any of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties
iso·to·pic \ˌī-sə-ˈtäp-ik, -ˈtō-pik\ adjective
iso·to·pi·cal·ly \-ˈtäp-i-k(ə-)lē, -ˈtō-pi-\ adverb
iso·to·py \ˈī-sə-ˌtō-pē, ī-ˈsät-ə-pē\ noun, plural iso·to·pies

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