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Author Question: Valence Electrons, i was wondering how do you figure out the # of electrons from 3s-4d.? (Read 747 times)

curlz

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on: Sep 20, 2013
I understand that something like lithium has 3 electrons and one valence electron  because theres one in the 2 level. Now if you got something in the 3d level do you consider the 3 level only or the 4s as well? I hope you guys understand what im trying to say. Help Please


Awilson837

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Reply #1 on: Sep 20, 2013
Valance electrons are only the outermost electrons of an atom. If there are any electrons the 4 level, then you only count those. No need to count the ones in the  3 level.

1s2 2s2 2p6 3s2 3p6 4s2 3d10
if the electron configuration is like this ( sorry no superscript), you still only count the electrons on the 4th energy level, even though the 3d level comes after it.

[the electrons fill up levels by energy efficiency, not by numerical order, that is why the 4s level  comes before 3d]

i hope this helps...


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