Excess electrons are placed on a small lead sphere so that its net charge is -3.20x10-9C. How many excess electrons are there on the sphere

Wavelength = pie*69+69 with ur mom

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.