The energy necessary to overcome the attractions of electrons to the nucleus of an atom so as to remove electrons from the atom is called
charging energy
electrical energy
ionization energy
electron energy

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.