Electron Configuration Of Copper And Chromium. 1s2 2s2 2p6 3s2 3p6 3d10 4s1. Some elements do not follow the aufbau principle there are some alternate ways that electrons can arrange themselves that give these elements better stability.
Copper is an exception to the rules for writing electron configurations! When we write the electronic configuration of cr (24) as per the ‘aufbau principle’ the 3d orbital contains 4 electrons and the 4s orbital contains 2 electrons. Electronic configuration of copper, with atomic number 2 9 = 1 s 2 2 s 2 2 p 6 3 s 2 3 p 6 4 s 1 3 d 1 0.
Each additional electron you add usually goes into a 3d orbital.
Both of the configurations have the correct numbers of electrons in each orbital, it is just a matter of how the electronic configuration notation is written (here is an explanation why). Copper is an exception to the rules for writing electron configurations! There are 118 elements in the periodic table. Write the orbital notation for this element.
