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Quantum number representations.

1. Are the following quantum number combinations allowed? If not, show how you would accurate them?
a. n = 2; l = 0; ml = - 1
b. n= 4; l=3; ml = -1

2. Which of the following orbital designations are incorrect? Why?
a. 1p
b. 4s
c. 3f
d. 6d

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