The table lists the number of protons, electrons, and neutrons in a certain radioactive nuclide. Electrons Protons Neutrons 11 11 13 Which is the symbol of this radioactive nuclide?

The number of protons is the atomic number, and element 11 is sodium (Na). The mass number is the total of protons and neutrons: 11 + 13 = 24. So the nuclide is sodium-24, shown in choice C.

AI-written and checked against the verified answer.