What happens if an atom loses a neutron?Its mass is lowered, but it is still the same element. Its mass stays the same, and it is still the same element. Its mass stays the same, and it becomes a different element. Its mass is lowered, and it becomes a different element.

If an atom were to gain or lose neutrons it becomes an isotope. ... If it gains a neutron it become an isotope called deuterium. Since the atomic mass is the total of the number of protons and neutrons, an isotope would have a different atomic mass, but the same atomic number as the original atom

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