Single Choice

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

A$$_{ 34 }^{ 78 }{ Se }$$
Correct Answer
B$$_{ 34 }^{ 77 }{ Se }$$
C$$_{ 33 }^{ 78 }{ Se }$$
D$$_{ 32 }^{ 77 }{ Ge }$$

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.

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