The atomic weight of an element is double its atomic number. If there are four electrons in the $2p$ orbital,the element is:

Which one of the following represents an impossible arrangement of quantum numbers?

When the value of the principal quantum number $n$ is $3$,what are the permitted values of the azimuthal quantum numbers $l$ and the corresponding magnetic quantum numbers $m$?

Explain the significance of the $+ve$ and $-ve$ signs in the context of atomic orbitals.

Which one is a wrong statement?

Find the exact orbital from the following for which $n=4$ and $l=1$.