April 18, 2015

Homework Help: Chem- quantum question

Posted by Amy on Tuesday, March 20, 2007 at 1:55pm.

Hi. My teacher is giving us a test tomorrow on quantum numbers and Iunderstand it except for Noble gas configuration. I saw the question below on it but it's not really what I need to know so any help would be great. :)

Question: My teacher said he'll give us a question like this "What is the noble gas configuration of Ag?"
How would one goes about solving that?

I don't know because Ag doesn't have a noble gas configuration. Ag^+ does but not Ag metal. Let's take a smaller atom, such as chlorine, atomic number 17.
It is 1s2 2s2 2p6 3s2 3p5 = 17
Adding an electron to make the noble gas, Ar = 18, gives
1s2 2s2 2p6 3s2 2p6 = 18.

I assume this is what you teacher meant.

After reading another unrelated question that Bob Pursley answered, you MAY be talking about putting this in "noble gas" configuration status, which is, for Cl, instead of writing
1s2 2s2 2p6 3s2 3p5 (=17)(that is, listing ALL of the electrons)
we would write
[Ne]3s2 3p5 and the [Ne] takes care of the first eight electrons.
Silver would be [Kr]4d10 5s1 in which [Kr] takes care of the first 36 electrons.
You can go to and see that notation for all the elements. I hope this helps.

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