The radial probability distribution curve for an orbital comprises of $3$ maxima. If the orbital has $3$ angular nodes as well,then the orbital can be:

Assertion $(A)$: Atoms with completely filled and half-filled subshells are stable.
Reason $(R)$: Completely filled and half-filled subshells have symmetrical distribution of electrons and have maximum exchange energy.
The correct answer is:

The magnetic quantum number for the valence electron of a sodium atom is:

The radial part of the wave function is determined by which quantum numbers?

The order of filling of electrons in the orbitals of an atom will be

Which of the following statements is true regarding the hydrogen atom?