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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
Share. By Anne Marie Helmenstine, Ph.D. Orbital Definition: Electron cloud having an energy state described by given values of the n, â, and m â quantum numbers. An orbital can contain two electrons with paired spins and is often associated with a specific region of an atom.xamples: The electrons in the 2p x orbital of an atom are generally found within a dumbbell-shaped cloud about the x-axis. Return to the Chemistry Glossary Index.