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WAEC Chemistry 2010 Theory — Question 3

Question 3 of 46 from the West African Examinations Council (WAEC) Chemistry 2010 Theory paper, with the correct answer and a full explanation.

1a(iii) Balance the following nuclear reactions and identify X and Y: I. ²¹²₈₄PO → ²⁰⁸₈₂Pb + X. II. ¹³⁷₅₅Cs → ¹³⁷₅₆Ba + Y.

Model answer

I. ²¹²₈₄PO → ²⁰⁸₈₂Pb + X, where X = Alpha particle (⁴₂He). II. ¹³⁷₅₅Cs → ¹³⁷₅₆Ba + Y, where Y = Beta particle (⁰₋₁e).

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