Sunday
March 29, 2015

Homework Help: Chemistry

Posted by Hannah on Tuesday, November 1, 2011 at 10:28pm.

1) What is the atomic # for selenium?
34

2) Write the full electron configuration for selenium following the (n+l) rule?

I am not sure what is meant by n+l

3) write the electron configuration, grouping electrons by their "n" values.

[Ar]3d10 4s2 4p4

Are these correct?

4) What is the number of valence electrons for selenium?
6
what is the number of core electrons?
I do not understand what core electrons are.

5) what is the number of unpaired electrons? Show how you determined this.

i think the answer is two but im not sure why.

6) What is the number of filled shells?
3
7) What is the number of filled orbitals?
4

Are these correct?

Please ignore the first two posts with these questions. My computer was acting up and submitted the question more than once. Sorry.

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