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How many protons neutrons and electrons in uranium 240? Uranium 240 has 92 protons and electrons, but 148 neutrons because the atomic number is 92 and the atomic mass is 240. Edit
In a neutral atom, the number of electrons is the same as the number of protons. The atomic number of aluminum is 13. A neutral atom of aluminum has 13 protons and 13 electrons. The ground state electron configuration for aluminum is #1s^22s^22p^63s^23p^1#. A shorthand way to write the electron configuration, called noble gas notation, is #[Ne]3^23p^1#.