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There are two naturally occurring isotopes of indium: indium-113 and indium-115. How many neutrons are in a single atom of indium-115? 49 66 115 164
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There are two naturally occurring isotopes of indium: indium-113 and indium-115. How many neutrons are in a single atom of indium-115?

49
66
115
164

User Sean McCauliff
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1 Answer

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There are 66 neutrons in a single atom of indium-115. The atomic number of indium-115 is 49, meaning there are 49 protons. Then the atomic mass is 115, so 115-49 = 66. 
User TheRealRonDez
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