The work function of an element is the energy required to re- move an electron from the surface of the solid element. The work function for lithium is 279.7 kJ/mol (that is, it takes 279.7 kJ of energy to remove one mole of electrons from one mole of Li atoms on the surface of Li metal). What is the max- imum wavelength of light that can remove an electron from an atom on the surface of lithium metal?