The number of unpaired electrons in an atom with atomic number $29$ is .....

The electrons,identified by quantum numbers $n$ and $l$ as $(i) n = 4, l = 1$,$(ii) n = 4, l = 0$,$(iii) n = 3, l = 2$,$(iv) n = 3, l = 1$,can be placed in order of increasing energy,from the lowest to highest,as:

Which of the following pairs of ions have the same electronic configuration?

The quantum number which specifies the location of an electron as well as energy is

The principal quantum number of an atom is related to the:

The angular momentum of an electron in a $2s$ orbital is equal to the angular momentum of an electron in which of the following orbitals?