p_x, p_y, p_z, d_xy, d_yz, d_xz, d_z², d_x²−y²

Correct Answer: 5

p_x, p_y and p_z orbitals have electron density along the respective axes.

Among d-orbitals, d_z² and d_x²−y² have electron density along the axes, while d_xy, d_yz and d_xz have electron density between the axes.

Hence, total orbitals having electron density along the axis = 3 + 2 = 5.