Hafnium, hf, is also found in group 4b. write the electron configuration for hf. express your answer in order of increasing orbital energy as a string without blank space between orbitals. for example, the electron configuration of li could be entered as 1s^22s^1 or [he]2s^1.

The ozone molecule o3 has a permanent dipole moment of 1.8×10−30 cm. although the molecule is very slightly bent-which is why it has a dipole moment-it can be modeled as a uniform rod of length 2.5×10−10 m with the dipole moment perpendicular to the axis of the rod. suppose an ozone molecule is in a 8000 n/c uniform electric field. in equilibrium, the dipole moment is aligned with the electric field. but if the molecule is rotated by a small angle and released, it will oscillate back and forth in simple harmonic motion.what is the frequency f of oscillation?