Template talk:Infobox element/symbol-to-electron-configuration

Am I seeing it wrong?

I'm looking at the chart, and from Scandium onward, it shows the 3d orbital before the 4s orbital and that's incorrect, right? Don't we have to re-do the chart now, or am I not getting something? Wolffe713 (talk) 05:56, 3 December 2021 (UTC)

Asking @Double sharp: -DePiep (talk) 07:05, 3 December 2021 (UTC)

@Wolffe713: Both ways of writing it are fine. The order you write the orbitals makes no claim about what order they fill in. Scandium [Ar] 3d¹ 4s² just means that there's one electron in the 3d and two in the 4s; it doesn't say that the 3d filled first.

Although actually, they did in a way. The configurations are: Sc³⁺, [Ar]; Sc²⁺, [Ar] 3d¹; Sc⁺, [Ar] 3d¹ 4s¹; Sc⁰, [Ar] 3d¹ 4s². So if you build up a scandium atom from a bare nucleus, indeed the 3d filled first. Comparing Ca to Sc is not really that important because "add a proton and an electron, there's the next element" is a process that happens at energies high enough to ionise the atoms altogether. Double sharp (talk) 10:24, 3 December 2021 (UTC)