Diatomic astatine, At2, is the rarest, heaviest, and largest of the halogens. Astatine has an atomic weight of 210 Daltons, and At₂ has a bond length of 300 pm. Use this information to determine its rotational constant, B, in units of cm-1 (you should keep only two significant figures). (Note: 1 Dalton = 1.66053 x 10-27 kg, 1 pm = 10-12 m.)

Diatomic astatine, At2, is the rarest, heaviest, and largest of the halogens. Astatine has an atomic weight of 210 Daltons, and At₂ has a bond length of 300 pm. Use this information to determine its rotational constant, B, in units of cm-1 (you should keep only two significant figures). (Note: 1 Dalton = 1.66053 x 10-27 kg, 1 pm = 10-12 m.)