Statement I : ${}_{19}^{39}K$ and ${}_{20}^{40}{Ca}$ are isotones
Statement II : Nucleids of same element having different mass number and different atomic number with same number of neutrons are called as isotones.

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Statement I and II both are true

Statement I and II both are incorrect

statement I is incorrect and Statement II is correct

statement I is correct and Statement II is incorrect

answer is D.

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Detailed Solution

Isotones are nucleids having same number of neutrons

Isotones are nucleids of different elements with different mass number and different atomic number but same number of neutrons

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