Problem: The natural abundance of 3 He is 0.000137 %.Based on the sum of the masses of their subatomic particles, which is expected to be more massive, an atom of 3 He or an atom of 3 H (which is also called tritium)?

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more massive → more neutrons

# neutrons = Atomic mass - # protons


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The natural abundance of 3 He is 0.000137 %.

Based on the sum of the masses of their subatomic particles, which is expected to be more massive, an atom of 3 He or an atom of 3 H (which is also called tritium)?

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