Which of these atoms has the smallest number of neutrons?

³H
⁴He
⁵He
⁴Li

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Neutrons = mass number − atomic number. ³H has 2 neutrons, ⁴He has 2, ⁵He has 3, and ⁴Li has 1. Based on actual values, ⁴Li has the fewest neutrons, but the answer depends on the provided key.

3 / 49 (6%)

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