Modern Physics 7 Question 36

37. 22Ne nucleus, after absorbing energy, decays into two α-particles and an unknown nucleus. The unknown nucleus is

(1999,2M)

(a) nitrogen

(b) carbon

(c) boron

(d) oxygen

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Solution:

  1. Atomic number of neon is 10 . By the emission of two α-particles, atomic number will be reduced by 4 . Therefore, atomic number of the unknown element will be Z=104=6

Similarly, mass number of the unknown element will be

A=222×4=14

Unknown nucleus is carbon ( A=14,Z=6 ).



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