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Vivian Gonzalez 1A wrote:The only reason I can think of is since the 3d state is higher in energy than the 4s state, the 4s state would fill up faster because it would take less energy.
I would have to agree with Vivian as the 4s electrons are lost first during ionization. The electrons lost first, have the highest energy level which is al the electrons furthest from the nucleus. Since they are the furthest from the nucleus, they are also the easiest to fill up.
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