Coal, oil, and natural gas are the 3 common fossil fuels
Just as a dozen is 12 of something, a mole is about 6.02 * 10^23 of something .
Like charges repel each other; unlike charges attract. Thus, two negative charges repel one another, while a positive charge attracts a negative charge. The attraction or repulsion acts along the line between the two charges. The size of the force varies inversely as the square of the distance between the two charges.
