Final answer:
Chromium-58 has 24 protons and 34 neutrons, obtained by subtracting Chromium's atomic number (24) from its mass number (58).
Step-by-step explanation:
The isotope Chromium-58 has 24 protons, as all isotopes of Chromium (Cr) have 24 protons which is the atomic number of the element. To find the number of neutrons in Chromium-58, we subtract the atomic number from the mass number. Thus, 58 (mass number) - 24 (atomic number) gives us 34 neutrons. Therefore, Chromium-58 has 24 protons and 34 neutrons in its nucleus.