Which of the following statements are correct?
(A) The electronic configuration of Cr is [Ar] 3d⁵ 4s¹.
(B) The magnetic quantum number may have a negative value.
(C) In the ground state of an atom, the orbitals are filled in order of their increasing energies.
(D) The total number of nodes are given by n 2.
Choose the most appropriate answer from the options given below :