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/sci/ - Science & Math

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7653862 No.7653862 [Reply] [Original]

Yo bros I'm tryna study why is 4s filled before 3d in multi-electron systems?

>> No.7653871

because the numbering scheme is retarded like everything chemists do.

>> No.7653896
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7653896

It's lower energy. Why? It just is. We've observed it to be that way. You could probably back it up with some quantum bullshit, but the easiest way is to observe it and see that it fills before the 3d, so just remember it.

What >>7653871 is getting at is that chemistry is a very empirical science, there's a lot of things out there that we know for sure happen but we can't quite explain why, so you just have to remember that it does

>> No.7653932

>>7653871
Got it!

>> No.7653990

>>7653871
>he fell at the first hurdle
The atomic orbital designations are organized acording to their calculated energies in hydrogen. The energy values change as you add proton and electron to the system. Long story short 4s gets shifted down while 3d gets shifted up thats why you fill 4s first.