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Which pair of symbols represent nuclei with the same number of neutrons?

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$^{56} Co$ and $^{58} Co$

$^{57} Mn$ and $^{57} Fe$

$^{57} Fe$ and $^{58} Ni$

$^{57} Co$ and $^{58} Ni$

answer is D.

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Detailed Solution

The symbols represent nuclei with the same number of neutrons is $^{57} Co$ and $^{58} Ni$

Isotones are any two or more atom or nuclei species that have the same amount of neutrons. Since cobalt-57 and nickel-58 are isotones, Since both atoms are mostly found with 28 neutrons, this suggests that cobalt-57 and nickel-58 are isotones.

Hence, the option D is correct.

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