F-block elements

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Krisdylle Repollo 4H
Posts: 33
Joined: Fri Sep 28, 2018 12:28 am

F-block elements

Postby Krisdylle Repollo 4H » Sun Oct 28, 2018 1:12 pm

I'm having trouble figuring out the electron configurations of the f-block elements. For example, the electron configuration for thorium is Rn6d^27s^2, but the atom is in the f-block of the periodic table. Why are the orbitals only d and s but not f? Is there a separate rule regarding the f-block elements of the table? Does it have something to do with their electron shells?

Posts: 66
Joined: Fri Sep 28, 2018 12:28 am

Re: F-block elements

Postby 305113590 » Sun Oct 28, 2018 1:27 pm

This is because of the Aufbau principle, which basically states that the orbitals/numbers must go in numerical order in simple terms. Since Thorium is in the 5f orbital, it will not be included in the shorthand/noble electron configuration you have given.

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