We know that the magnitudes of the negative charge on the electron and the positive charge on the proton are equal. suppose, however, that these magnitudes differ from each other by 0.00040%. with what force would two copper coins, placed 1.1 m apart, repel each other? assume that each coin contains 2.5 × 1022 copper atoms. (hint: a neutral copper atom contains 29 protons and 29 electrons.)

Efficiency is an act of doing something

An  atom  (ours, not carroll's) consists of a positively charged  nucleus, surrounded by one or more negatively charged particles called  electrons. the positive charges equal the negative charges, so the atom has no overall charge; it is electrically neutral. most of an atom's mass is in its nucleus; the mass of an electron is only 1/1836 the mass of the lightest nucleus, that of hydrogen. although the nucleus is heavy, it is quite small compared with the overall size of an atom. the radius of a typical atom is around 0.1 to 0.25 nanometres (nm), whereas the radius of a nucleus is about 10-6  nm.  *  if an atom were enlarged to the size of the earth, its nucleus would be only 200 feet in diameter and could easily rest inside a small football stadium.read more on -