The work function of sodium is 2.75 eV. Calculate the threshold wavelength of light at which emission of photoelectrons will first be observed

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

How many molecules are found in 1.32 mol of nacl?

Which of the following observations indicates that there is a small, dense, positively charged part in the center of an atom? some uncharged particles are scattered by a gold foil. all uncharged particles are attracted towards a gold foil. all positively charged particles pass straight through a gold foil. some positively charged particles bounce back from a gold foil.