What is the difference between o2 and f2

Asap! how do you lengthen a pattern piece? (family and consumer science, sewing)

Identify a strong intermolecular force of attraction between an alcohol

The bond energy for the van der waals bond between two helium atoms is 7.9×10−4ev. assuming that the average kinetic energy of a helium atom is (3/2)kbt, at what temperature is the average kinetic energy equal to the bond energy between two helium atoms