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Q.
Atoms having different atomic number as well as different mass number but having same number of neutrons:
AFMCAFMC 2003
Solution:
Two nuclides are isotones if they have the same number of neutrons. For example, boron-$12$ and carbon -$13$, both have $7$ neutrons. While isotopes are nuclides having the same number of protons Isobars are two nuclides with the same mass number. The nuclides which have same neutrons to protons difference are is odiaphers.