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Question

A radioactive nucleus decays according to following series
XαX1βX2αX3γX4
If the atomic number and atomic weight of the parent element X are 72 and 180 respectively, then the atomic number and atomic mass of X4 are respectively
  1. 70, 172
  2. 69, 172
  3. 69, 171
  4. 68, 172


Solution

The correct option is B 69, 172
We know that An alpha particle is basically a Helium nucleus. A beta (minus) particle is a high speed electron. Their mass is ~ 12000amu . A gamma ray is NOT a particle.

So by mass and charge balance we can write that, 
18072Xα17670X1β17671X2α17269X3γ17269X4
(c) is the correct option. 

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