Which of the following are isotopes?

Options

A. `""_(7)^(14)N` and `""_(6)^(14)C`
B. `""_(17)^(35)Cl` and `""_(17)^(37)Cl`
C. `""_(12)^(24)Mg` and `""_(11)^(23)Na`
D. `""_(18)^(40)Ar` and `""_(17)^(37)Cl`

Answer

B