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Posted: Sun Oct 27, 2019 6:44 pm
When writing the electron configuration for rubidium, it goes all the way up to the 5s row. But when writing 4s^2 and 3d^10, would you write the 3d^10 before or after the 4s^2, because both are filled. I think the filled 3d^10 would have more energy, but it also starts with 3 and being consistent with the numbers could also be the way to write it?
Posted: Sun Oct 27, 2019 6:48 pm
You would write the 3d10 first, because we always write electron configuration in ascending n order. Also, after there are electrons in the 3d orbital, its energy becomes less than the 4s orbital.
Posted: Mon Oct 28, 2019 9:21 am
I was confused about this too. I thought we were supposed to switch the 4s and 3d orbitals when writing out the configuration. Why is it 3d then 4s in the book? Must the 3d be filled to switch back to before the 4s? Thanks.