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Isotopes

APCHEM-PLVKJ4

Which of the following choices consists of a pair of isotopes?

A

$^{35}Cl$ and $^{35}Cl^{-}$

B

$^{14}C$ and $^{14}N$

C

$^7Li$ and $^7Li^{+}$

D

$^{32}S$ and $^{33}S$