What's the number of protons, neutrons, and electrons in an atom of aluminum-27? Why?
The atomic number of Aluminum is 13 (look at a periodic table)This means 13 protons and 13 electrons (since these are oppositely charged they have to balance each other.) To find the number of neutrons you subtract the number of protons from the atomic mass (the atomic mass is 27)So 27-13 14 neutrons
