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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
How many electrons does aluminum have? Well, it has 13 protons, so a neutral atom of aluminum must have 13 electrons. Which electrons are they? Well, it has two 1 s electrons, two 2 s electrons, six 2 p electrons, two 3 s electrons, and one lonely 3 p electron.hat electron is called a 1 s electron. Helium (in the very top right corner box), labeled 1 s ^2, has two electrons. Both of them are 1 s electrons. Lithium is in the box that is labeled 2 s ^1. An atom of lithium has three electrons: two 1 s electrons and a 2 s electron.