2, 1 s level and 1 p level
The nitrogen atom has three electron shells (energy levels), specifically: 1s2, 2s2, and 2p3, accommodating a total of 7 electrons
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there are two shells of electrons in the nitrogen atom that actually have electrons in them, nitrogen has two electrons in the first shell, the S orbital, and five in the outer shell, the P orbital. this causes nitrogen to have a valence shell with five electrons.
Phosphorus has 3 shells. The outer shell contains 5 electrons. The electronic configuration is :- 1s2, 2s2, 2p6, 3s2, 3p3
flurine has atomic no. 9 so its electronic configaration is 2,7. Its valance shell has 7 electrons
Nitrogen has 7 electrons, oxygen has 8 electrons, and chlorine has 9 electrons. That is the total electron count, for inner and outer shells. If you are only concerned with the valance electrons, then it is 5 for nitrogen, 6 for oxygen, and 7 for chlorine.
Sodium has three electron shells.