The calculated spin only magnetic moments of \( [\mathrm{Cr(NH_3)_6}]^{3+} \) and \( [\mathrm{CuF_6}]^{3-} \) in \( \text{BM} \), respectively, are: (Atomic numbers of \( \mathrm{Cr} \) and \( \mathrm{Cu} \) are \( 24 \) and \( 29 \), respectively)
\( 3.87 \) and \( 2.84 \)
\( 4.90 \) and \( 1.73 \)
\( 3.87 \) and \( 1.73 \)
\( 4.90 \) and \( 2.84 \)