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What is the mass number of an isotope of this atom that has 2 neutrons?

What is the mass number of an isotope of this atom that has 2 neutrons?
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What is the mass number of an isotope of this atom that has 2 neutrons?

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User FlatDog
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From left to right, the isotopes are protium (1H) with zero neutrons, deuterium (2H) with one neutron, and tritium (3H) with two neutrons.
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User James Heston
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