A) \[_{32}G{{e}^{77}}\]
B) \[_{34}S{{e}^{78}}\]
C) \[_{36}K{{r}^{79}}\]
D) \[_{32}G{{e}^{78}}\]
Correct Answer: B
Solution :
Atoms of different elements which contain the same number of neutrons are called isotones. Hence, \[_{34}S{{e}^{78}}\]is the isotone of \[_{32}G{{e}^{76}}\](both have 44 neutrons).
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