Which of the following are isotone of $_{32}^{76} G e$ ?

_{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}^{78} S e

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Solution

The correct options are
B $_{33}^{77} A s$
D $_{34}^{78} S e$
Isotones are the elements having the same number of neutrons.

$Mass number = number of protons + number of neutrons.$
$Atomic number = number of protons = number of electrons.$
$Number of neutrons = mass number - number of protons = mass number - atomic number.$
Number of neutrons will be the same in $_{33}^{77} A s (77 - 33 = 44)$ and $_{34}^{78} S e (78 - 34 = 44)$ , as in $_{32}^{76} G e (76 - 32 = 44)$ . Hence, these are isotones.
But the number of neutrons in $_{32}^{77} G e (77 - 32 = 45)$ and $_{34}^{77} S e (77 - 34 = 43)$ , are different than the number of neutrons in $_{32}^{76} G e (76 - 32 = 44)$ .

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14^{t h}

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