The value of ${\psi }^2\mathrm{}\left(0\right)\mathrm{}$ for the $7s$ state of Tl I is calculated relativistically and compared with the value determined from the formula ${\psi }^2\mathrm{}\left(0\right)=\frac{Z_i{Z_0}^2}{\pi {a^3}_H{n_0}^3}$. With the experimental value of the hyperfine structure splitting of this level, the magnetic moment of the Tl nucleus is found to be: $1840g\cong 2.7$. The $f$ values corresponding to the transitions $p_{\frac{3}{2}}{s}_{\frac{1}{2}}$ and $p_{\frac{1}{2}}{s}_{\frac{1}{2}}$ are also determined and are found to be in agreement with experiment when the effect of a perturbation is taken into account.

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