Calculate the van der Waals coefficient C VDW for two neon atoms interacting in a vacuum. You may assume the orbital frequency is 5.510^15 Hz and the polarizability divided by the usual constants /(40) = 0.39 10^30 m3. Then use this value to calculate the strength of the van der Waals bond at contact if the van der Waals radius for neon is 0.154 nm.