Two radioactive elements X and Y have half-lives of 100 and 50 years respectively. Samples of X and Y initially contain equal number of atoms. What is the ratio of the number of the remaining atoms of X to that of Y after 200 years?
A. 4:1
B. 3:1
C. 1:1
D. 1:2
E. 1:4
Correct Answer:
Option D – 1:2
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![What is the mass of 6.02 x 10^24 atoms of magnesium? [Mg = 24, Avogadro constant = 6.02 x 10^23 atoms mol-1]](https://erudites.ng/wp-content/plugins/contextual-related-posts/default.png "What is the mass of 6.02 x 10^24 atoms of magnesium? [Mg = 24, Avogadro constant = 6.02 x 10^23 atoms mol-1]")