Which of the following gases does not have an octet or eight electrons in the outer shell?

To which orbital among the following may an electron having zero angular momentum belong?

If an electron has a spin quantum number of $+ \frac{1}{2}$ and a magnetic quantum number of $- 1$,it cannot be present in an

What are the four quantum numbers for the valence electron of sodium $(Z = 11)$?

The magnetic quantum number $m_l$ is determined by the azimuthal quantum number $l$. If $l = 2$,what are the type and number of orbitals indicated?

If the electronic configuration of a nitrogen atom were $1s^7$,its energy would be lower than the ground state configuration $1s^2 2s^2 2p^3$ because the electrons would be closer to the nucleus. However,the configuration $1s^7$ is not observed. Which of the following principles is violated?