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Nuetrik [128]
4 years ago
7

Can someone please help me:)

Chemistry
1 answer:
Andru [333]4 years ago
8 0
We have here Radon Rn with mass number = 86 protons + 136 neutrons = 222. Therefore, we have Rn222. The alpha radiation emits particles in the same size of the He atom whose mass number equals 4. By subtracting 4 from 222 we get 218 which is the mass number of Polonium Po218 with 84 protons and 134 neutrons.
Therefore, the right answer is C.
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