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

_{32}^{77} G e

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_{33}^{77} A s

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_{34}^{77} S e

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_{34}^{74} S e

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Solution

The correct option is C $_{33}^{77} A s$
Isotones are the elements having the same number of neutrons.
Mass number A $=$ No. of protons $+$ No. of neutrons
Atomic number $=$ No. of protons $=$ No. of electrons
No. of neutrons $=$ Mass number A $-$ No. of protons $=$ Mass number A $-$ Atomic number
No. of neutrons will be the same in $_{33}^{77} A s$ , i.e., $44$ as in $_{32}^{76} G e$ .

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