$^{35}_{17}Cl$ and $^{37}_{17}Cl$ are called

Aisomers.

Bisotopes.

Cmonomers.

Dpolymers.

Explanation

Both have proton number 17 but different mass numbers 35 and 37, so they are isotopes of chlorine.

ZIMSEC Combined Science 4003/1, Specimen Paper 2018, Q15

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