![]() ![]() The next two would fill the 2s orbital leaving the remaining four electrons to take spots in the 2p orbital. The Aufbau principle says the first two electrons would fill the 1s orbital. e is the number of electrons in that orbital shell.įor example, oxygen has eight protons and eight electrons.The notation seen on period tables for electron configurations uses the form: ![]() The electron configuration of silicon is: It could have been the second and third slot or the first and third. In this case, the two spin-up electrons are placed in the first two empty slots, but the actual order is arbitrary. One of the rules of the Aufbau principle is that the orbitals are filled by one type of spin before the opposite spin starts to appear. Step E shows the remaining two electrons starting to fill the 3p orbital.Step D fills the next lowest energy level, 3s with two electrons.Step C shows these six electrons and leaves four electrons.(The 2p orbital is the next available energy level and can hold six electrons.) Step B shows the next two electrons filling the 2s orbital leaving 10 electrons.Step A shows the first two electrons filling the 1s orbital and leaving 12 electrons.The arrows in the graphic show the s quantum numbers, spin up and spin down. The lowest energy level of an atom is filled first. This is a worked example problem showing the steps necessary to determine the electron configuration of an element using the principles learned in the previous sectionsĭetermine the electron configuration of silicon. The final three electrons will go to the 2p orbital, which can hold up to six electrons. The next orbital is the 2s orbital and holds the next two. An s orbital holds two electrons, so five electrons are left. The first orbital to fill is the 1s orbital. This is all you need to determine the electron configuration of a stable atom of an element.įor example, take the element nitrogen, which has seven protons and therefore seven electrons. F orbitals have seven possible value of m to hold 14 electrons.D orbitals have five possible value of m to hold 10 electrons. ![]()
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