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  4. An isotone of 7632Ge is

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Q. An isotone of $^{76}_{32}Ge$ is

IIT JEEIIT JEE 1984Structure of Atom

Solution:

Two nuclides are isotones if they have the very same neutron number but different proton number. For example, boron-$12$ and carbon-$13$ nuclei both contain $7 $ neutrons, and so are isotones.
So, isotone of $Ge$ (atomic number $32$ , mass number $76$ ) is $Se$ (atomic number $34$ and mass number $78$).
The number of neutrons of $Ge$ here is $76-32=44$, now in $Se$ here, $78-34=44$ neutrons, due to a same number of neutrons, these are isotones.