Among these iron, copper, and zinc nuclides — iron-59, copper-61, and zinc-61 —

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1. Among these iron, copper, and zinc nuclides — iron-59, copper-61, and zinc-61 — which contains the most neutrons?

Iron-59

Copper-61

Zinc-61

Zinc-60, doubly charged

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Iron-59 has 26 protons, giving it 59 − 26 = 33 neutrons — more than copper-61’s 32 neutrons or zinc-61’s 31 neutrons.