A correct description for the electron configuration of an iron atom is
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Electrons have a specific form of distribution (or configuration) in every atom, even Phosphorus. Some are hard to memorise (or predict), so what is the electron configuration of an atom of P? In the case of Phosphorus the abbreviated electron configuration is [Ne] 3s2 3p3. Nevertheless, check the complete configuration and other interesting ...
That gives you the correct electron configuration, argon 4s 2, 3d 1. But it's implying that the d orbitals, the 3d orbitals fill after the 4s orbital and is therefore a higher energy and that's not true actually. It does help you to just assume that's the case if you're writing an electron configuration but that's not what's happening in reality.