How many electrons are in the filament of a light bulb?

I think you probably know that the flow of electrons causes the filament to heat up and glow when the electricity is switched on and you want to know the number of electrons in the electricity?

Well, it doesn't work quite like that, the electrons are all in the electron shells of the tungsten atoms making up the filament and there are the same number of electrons in these shells (and thus he filament) whether the electricity is on or off.

When electricity is on, the electrons (in the outer shells) hop from one atom to the next, no extra electrons get into the filament (electrons coming in at one end are balanced by electrons going out at the other end)

While all atoms have electrons, not all elements have atoms with 'free' electrons to allow this hopping - these elements will not conduct electricity.