Radon-222 has atomic number 86 and decays by alpha emission. What are the mass number and atomic number of the daughter nucleus?

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Question

Radon-222 has atomic number 86 and decays by alpha emission. What are the mass number and atomic number of the daughter nucleus?

Accepted Answer

218 and 84 — Award 1 mark. Alpha emission removes 4 from the mass number, giving 222 − 4 = 218, and 2 from the atomic number, giving 86 − 2 = 84. Adding rather than subtracting the two protons gives 88.

Answer

218 and 84

Answer

220 and 85

Answer

222 and 84

Answer

218 and 88

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