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Question

If 92U238 changes to 85At210 by a series α and βdecays, the number of α and βdecays undergone is
  1. 7 and 7
  2. 7 and 5
  3. 5 and 7
  4. 7 and 9

A
7 and 5
B
7 and 7
C
5 and 7
D
7 and 9
Solution
Verified by Toppr

An alpha particle is a doubly charged Helium ion.
α=He2+
Mass no. of α = 4
Atomic no. of α = 2

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