WAEC Physics 2015 Objective — Question 50

Question 50 of 50 from the West African Examinations Council (WAEC) Physics 2015 Objective paper, with the correct answer and a full explanation.

²²⁶Ra emits two alpha particles to produce Polonium (Po) nuclide. The correct formula for the nuclide is

A. ²²⁴₈₆Po
B. ²²²₈₆Po
C. ²²²₈₄Po
D. ²¹⁸₈₄PoCorrect

Explanation

Each alpha particle reduces the mass number by 4 and the atomic number by 2. Two alpha particles: mass number 226−8=218, atomic number 88−4=84, giving ²¹⁸₈₄Po.

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