Which of the following is an isotonic pair?

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(B) Isotones are atoms that have the same number of neutrons $(n = A - Z)$.For option $A$: $_{19}^{40}K$ has $40 - 19 = 21$ neutrons,$_{20}^{40}Ca$ ha

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$_{19}^{39}K, _{20}^{40}Ca$

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(B) Isotones are atoms that have the same number of neutrons $(n = A - Z)$.For option $A$: $_{19}^{40}K$ has $40 - 19 = 21$ neutrons,$_{20}^{40}Ca$ has $40 - 20 = 20$ neutrons.For option $B$: $_{19}^{39}K$ has $39 - 19 = 20$ neutrons,$_{20}^{40}Ca$ has $40 - 20 = 20$ neutrons.Since both species in option $B$ have $20$ neutrons,they form an isotonic pair.

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