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The total number of neutrons in dipositive zinc ions with mass number 70 is:
(1) 34
(2) 40
(3) 36
(4) 38
Ans:40
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An isotope of iodine (Z = 53) is used to treat thyroid conditions. Its mass number is 131. How many neutrons are in its nucleus? 131 - 53 = 78 neutrons
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