Which of the following statements are correct

Options

A. The number of orbitals for a given value of l is equal to 2 l+ 1
B. The number of orbitals for a given value of n is equal to `n^2`
C. An atom having unpaired electrons: is diamagnetic is nature
D. The half-filled and fully-filled electronic configurations are less stable than the other configuration having the same number of electrons.

Answer

A, B

Explanation

a) The number of orbitals for a given value of l is equal to the permitted value of m which can take values, `0 pm , 1 , pm 2 , …."" pm 1` , a total of 2 l + 1 values.
c) A diamagnetic atom has no unpaired electrons .
d) The half-filled and fully electronic confighrations are more stable. it is due to the larger exchange energy.