Use the periodic table to determine which of the following could be an isotope of indium (In). Check all that apply.

An isotope of indium must have atomic number Z = 49. Choice A gives Z = 49 directly. In choice B, Z = 49 and N = 64, so its mass number is A = Z + N = 49 + 64 = 113; it can also be an indium isotope. Choice C gives Z = 113 − 61 = 52, and choice D gives Z = 110 − 49 = 61, so neither is indium.

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