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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Nuclide:

NUCLIDE: See 37-Down (sigh... sorry)
ISOMER: Certain nuclide
ISOTONE: One of two nuclides with the same neutron number but different proton numbers
ISOMER: Chemical nuclide
ISOTOPE: Nuclide.
ISOTONE: Nuclide
ATOM: Nuclide, e.g.
ISOMERS: Paired nuclides