Chemistry / Alpha Decay
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Solution: An atom of the element of atomic number 84 and mass number 1...

Question

An atom of the element of atomic number 84 and mass number 199 emits an alpha particle. The residual atom after this change has an atomic number of ___ and a mass number of ___.

(A) 82, 195

(B) 84, 203

(C) 85, 195

(D) 86, 199