I initially had a really hard time on our conversion factor unit, so I really need help on how to solve this problem: The diameter of the tungsten wire in a light bulb filament is very small, less than two-thousandths of an inch, or about 1/20 mm. The mass of the filament is also very small, 0.0176 grams. How many tungsten atoms are in a typical light bulb filament?

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.