Explain why argon is used in tungsten filament lamps

In the millikan oil drop experiment they determined that every drop had a charge which was a while number multiple of -1.60x10^-19. if a drop has a total charge of -9.60x10^-19 then how many excess electrons are contained within the drop?

Do polar molecules have ionic bonds?

In which of the following phases of matter do molecules have the highest amount of energy? a. liquid b. gel c. solid d. gas