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If the nuclear radius of ²⁷₁₃Al is taken to be 3.6 fermi, then the approximate radius of the ¹²⁵₅₂Te nucleus is

1. 8 fermi
2. 6 fermi
3. 5 fermi
4. 4 fermi

Correct answer: 6 fermi

Solution

The radius of a nucleus can be estimated using the empirical formula that relates nuclear radius to mass number, suggesting that larger nuclei have larger radii. Given that ¹²⁵₅₂Te has a greater mass number than ²⁷₁₃Al, it is reasonable to conclude that its radius would be larger, and 6 fermi is a suitable approximation based on this relationship.

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