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22688Ra → x86Rn + alpha particle

22688Ra → x86Rn + alpha particle

A.

226

B.

220

C.

227

D.

222

View answer & explanation

Correct answer is D

22688Ra → x86Rn + 42He

42He = alpha particle

considering the summation of the mass number

226 = x + 4

x = 226 - 4

x = 222

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