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<p>and occupy the x-axis in the <a href="page.php?w=cartesian_coordinate_system">cartesian coordinate system</a>. The p-orbitals are <a href="page.php?w=perpendicular">perpendicular</a> to the sp-orbitals on the y-axis and the z-axis. When the atoms approach each other, the sp orbitals overlap to form an sp-sp <a href="page.php?w=sigma_bond">sigma bond</a>. At the same time the p<sub>z</sub>-orbitals approach and together they form a p<sub>z</sub>-p<sub>z</sub> <a href="page.php?w=pi-bond">pi-bond</a>. Likewise, the other pair of p<sub>y</sub>-orbitals</p><p>
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