Nuclear Chemistry - Result Question 5

####8. When a radioactive element emits successively one α-particle and two β-particles, the mass number of the daughter element

[1999]

(a) is reduced by 4 units

(b) remains the same

(c) is reduced by 2 units

(d) is increased by 2 units

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Solution:

  1. (a) Mass number is affected by emmision of α particle while β-particle has negligible mass does not effect mass number. e.g.

ZAαZ2XA4βZ2+1XA4

βXA4



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