Post-UTME Physics 2018 Objective — Question 7

Question 7 of 20 from the Post-UTME Screening (Post-UTME) Physics 2018 Objective paper, with the correct answer and a full explanation.

226-88-Ra -> X + 222-86-Rn. In the above nuclear equation, X represents

A. an electron
B. an alpha particleCorrect
C. a beta particle
D. a gamma ray

Explanation

Mass number balance: 226 = A(X) + 222, so A(X)=4. Atomic number balance: 88 = Z(X) + 86, so Z(X)=2. A particle with mass number 4 and atomic number 2 is an alpha particle.

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