.Radon-220 (220Rn86) is radioactive and decays to Polonium-216 with the emission of an α-particle. How many neutrons are in the radon and polonium nuclei?
Answers
No. of neutrons in Radon = 134
No. of neutrons in Polonium = 132
Explanation:
Atomic number of Radon (Rn) = 86
We know that atomic number is nothing but the number of protons
Therefore, no. of protons in Rn = 86
Mass number of Rn = 220
Mass number is sum of protons + neutrons
No. of protons + No. of neutrons = Mass number
No. of neutrons = Mass number - no. of protons
= 220 - 86 = 134
We know that alpha particle has 2 protons and 2 neutrons
Therefore after emitting alpha particle, the number of neutrons in the new element will be
= 134 - 2 = 132
Hope this answer is helpful.
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