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1)Thus based on the diagram , the values of principle quantum number that can be assigned to the electrons are : 2,3 and 4.

2)This quantum number tells us the shell in which an electron is present and how far it is roughly from the nucleus.

Explanation:

According to the rules of electron filling in subshells in quantum mechanics , Aufbau's principle states that :

"An electron must be filled in a lower energy state or subshell and then higher. If they have the same energy , the one with lesser principal quantum number will be filled first."

Thus ,

The series of filling goes like:

Thus , the subshells in the given information have 1,3 and 1 orbitals respectively. Thus it has to be which is possible in two cases :

1)Thus based on the diagram , the values of principle quantum number that can be assigned to the electrons are : 2,3 and 4.

2)This quantum number tells us the shell in which an electron is present and how far it is roughly from the nucleus.