According to aufbau principle why dont chromium and copper follow it.
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Thanks to you. You know what does 3d subshell dont contain 4 electrons.In actual configuration of Cr(chromium) 3d subshell is containing 5 electron4s2 3d4 Cu = [Ar] 4s2 3d9 The actual electron configurations are:Cr = [Ar] 4s1 3d5 Cu = [Ar] 4s1 3d10
Some elements do not follow the Aufbau principle, there are some alternate ways that electrons can arrange themselves that give these elements better stability.Explanation:Using the Aufbau principle, you would write the following electron configurationsCr = [Ar]