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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
The atomic number of an atom in the ground state is the same as the atomic number. So, sodium should contain 11 electrons in its electron configuration and magnesium should contain 12 electrons in its electron configuration. Each atom occupies an orbital in a certain order.