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Comprehension
The wave function for an atomic orbital of single electron atom or ion is
\[
\Psi(\mathrm{r}, \theta, \phi)=\frac{2}{3}\left(\frac{\mathrm{Z}}{3 \mathrm{a}_{0}}\right)^{3 / 2}(1-\sigma)\left(12-8 \sigma+\sigma^{2}\right) \cdot \sigma \cdot \mathrm{e}^{-\sigma / 2} \cdot \cos \theta
\]
where \( \sigma=\left(\frac{2 \mathrm{Zr}}{\mathrm{na}_{0}}\right) \) and \( \mathrm{a}_{0}=0.529 \AA \). All other parameters have their usual meaning.
If \( \theta \) is the angle measured from Z-axis, then the orbital should be:
(a) \( \mathrm{p}_{\mathrm{x}} \)
(b) \( \mathrm{p}_{\mathrm{y}} \)
(c) \( \mathrm{p}_{\mathrm{z}} \)
(d) \( \mathrm{d}_{\mathrm{z}^{2}} \)
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