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Now add one neutron to make Boron -12. Notice that the atom shakes. This 11 Q Maks Number Neutrons Atcenic Mass (armi) indicates that the isotope is unstable. Unstable isotopes undergo radioactive decay. You will need to note this for other elements in the table below. Symbol C 18 2 8 0 Be HeF Name Carbon-13 Beryllium-10 Protons Neutrons 6 2 10 Electrons Atomic Mass 18.99840 Abundance Stable OR Unstable