NOUN: “any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties” Crossword Clue

We have the answer for NOUN: "any of two or more species of atoms of a chemical element with the same atomic number and nearly identical chemical behavior but with differing atomic mass or mass number and different physical properties" crossword clue that will help you solve the crossword puzzle you're working on!