JAMB Biology 2015 Objective — Question 34

Question 34 of 50 from the Joint Admissions and Matriculation Board (JAMB) Biology 2015 Objective paper, with the correct answer and a full explanation.

²³⁴₉₀Th → ˣ_yPa + β. In the reaction above, x and y respectively are

A. 234 and 91Correct
B. 235 and 90
C. 233 and 89
D. 230 and 86

Explanation

Beta decay: mass number is conserved (x=234) while atomic number increases by 1 (y=91).

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