Tuesday
July 22, 2014

Homework Help: Chem:DrBob

Posted by Shadow on Tuesday, November 6, 2012 at 6:38pm.

Dr.Bob, yesterday you told me :
"The best way I think is to show examples.
12Mg = 1s2 2s2 2p6 3s2
Here the 1s orbital is lower than the 2s and they are lower than the 3s etc."

19K = 1s2 2s2 2p6 3s2 3p6 3d0 4s2
Here the 1s is lower than the 2s and those are lower than the 3s and the 4s BUT the 4s level is lower than the 3d. " for what I wrote below but isn't the electron config for 19K is 1s2 2s2 2p6 3s2 3p6 4s1 ?

The orbitals of a principal energy level are lower in energy than the orbitals in the next higher principal energy level.

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