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Author Question: How many valence electrons are there in an atom with 24 electrons? (Read 684 times)

tth

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on: Sep 20, 2013
Considering I was not given the element name, this is all the information I have to figure out the valence electron number.

Can someone please show me the steps and how to arrive at the correct answer please!


folubunmi

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Reply #1 on: Sep 20, 2013
First ring takes 2 electrons
next one takes 8
next one takes 8 again
last ring has 6 electrons left
6 valence electrons


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Sandstorm

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Reply #2 on: Sep 20, 2013
for a neutral atom with 24 electrons, the element is Cr, this is a transition metal. it has 2 valance electrons, those of the 4s orbital. hybridization of Cr allows for its other oxidation states.


futuristic

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Reply #3 on: Sep 20, 2013
Atoms do not have a charge so, knowing that the atom has 24 electrons tells us the atom is the one having an atomic mass of 24 - its chromium.  Chromium has 1 valence electron; its electron configuration is: 1s2 2s2 2p6 3s2 3p6 4s1 3d5. We would expect the final electron configuration to be 4s2 3d4, but because of the greater stability of having a half-full d sublevel, one 4s electron moves to the 3d giving (instead of 4s2 3d4) 4s1 3d5. Valence electrons are those with the highest principle quantum number - 4th energy level in this case.


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