# Principal and Orbital QN

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Find the following:

<r> for the 2p0

<r2> for the 2p1

https://brainmass.com/chemistry/general-chemistry/principal-orbital-qn-4294

#### Solution Preview

Please see the attached file.

2p means n=2 and l=1

n is te principal QN and l is the orbital QN

For n = 1,2, 3 , l can take 0,1,2...(n-1) values

Similarly ml can take -l , 0,- l values. Here is the magnetic orbital QN

For each magnetic QN, there can be 2 spin states +1/2 and -1/2.

So when you say 2p0, the 0 ...

#### Solution Summary

This solutions provides a detailed explanation and breakdown in 264 words of the meaning of 2p, including orbital and principal QN. The solution for r is shown through the use of a radial wave function.

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