3. L. Khriachtchev, M. Pettersson, A. Lignell, and M. Räsänen (pages 8610-8611) studied the photochemical reaction of HF in an Ar matrix and found spectroscopic evidence for HArF. Write the Lewis structure for HArF, determine the structure, indicate the likely sigma hybrization about the Ar atom, and give the point group of the molecule.