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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 phrase electron cloud first came into use around 1925, when Erwin SchrÃ¶dinger and Werner Heisenberg were seeking for a way to describe the uncertainty of the position of electrons in an atom. The electron cloud model differs from the more simplistic Bohr model, in which electrons orbit the nucleus in much the same way as planets orbit the Sun. In the cloud model, there are regions where an electron may likely be found, but it's theoretically possible for it to be located anywhere, including inside the nucleus.