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Which answer choice represents a balanced alpha emission nuclear equation? A. 52 26 Fe --> 52 25 Mn+ 0 ⁺1 e. B. 235 92 U --▻ 239 94 Pu + 4 2 He C. 189 83 Bi --▻ 185 81 Tl + 4 2 He D. 14 6 C --▻ 14 7 N + 0 -1 e

Ramon Kelly

in Chemistry

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Justin Parker on June 3, 2018

The answer is "C".alpha decay is the emission of ₂⁴He core. If an element undergoes an alpha decay, the mass of the daughter nucleus formed is decreased by 4 in comparison with the mass of the parent atom, while the atomic number of the parent atom decreases by 2.Here, Bi is the atomic number as the 83 and the mass number as 189. When you undergo an alpha emission, formed daughter atom has 83 - 2 = 81 as the atomic number, and 189 - 4 = 185 as the mass number. The element 81 as its atomic number is Thallium (Tl).


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