Why does the D block start with 3d?
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Darren Nguyen 1F
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Johnathan Smith 1D
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Re: Why does the D block start with 3d?
When it's empty, the 3d-orbital requires more energy than 4s so it is placed after 4s, but when you start to fill up the 3d-orbital, the energy required to fill it becomes less than it is for the 4s-orbital which is why is 3d and not 4d.
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