A d-block element forms octahedral complex but its spin magnetic moment remains same either in strong field or in weak field ligand. Which of the following is/are correct ?

Options

A. Element always forms colourless compound
B. Number of electron in `t_(2g)` orbitals are higher than in `e_(g)` orbitals
C. It can have either `d^(3) or d^(8)` configuration
D. It can have either `d^(7) or d^(8)` configuration

Answer

B, C

Explanation

Irrespective nature of ligand field, magnetic moment of octahedral complexes having metal ions in `d^(1),d^(2),d^(3),d^(8),d^(9)` configuration, remains same.
Element may or may not form colourless complex.