What light has the highest frequency

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Asolid that forms and separates from a liquid mixture is called

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