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Yes, the spin-only magnetic moment is used for compounds with a t1g ground state energy term. This is because the t1g orbitals are degenerate (have the same energy) and are partially filled with electrons. This means that the compound has unpaired electrons, which give rise to a magnetic moment. The spin-only magnetic moment is a theoretical value that accounts for the contribution of electron spins to the overall magnetic moment. It is calculated using the formula: μs = √n(n+2) BM, where n is the number of unpaired electrons and BM is the Bohr magneton.