Structure of the atom

Atom is very small, about 1000millionths of a millimeter in diameter.  Although the atom is very small, but it is located in the center of the atom's nucleus and tiny electronic center of movement of these electrons around the atomic nucleus like the planets of the solar system around the sun.

From the British chemist and physicist J.John, Dalton after the creation of atomic theory, for a long time people thought that atoms like a despicably small glass medicine ball, which is no longerthere is no pattern.
In 1869, German scientists Hittorf found that cathoderay, a large number of scientists studied the cathode ray tube, which lasted more that twenty years.  Ultimatelym by Joseph, John Thomson discovered the existence of electrons.  Under normal circunstances, the atom is uncharged, since ran out of the small 1700 times more than its quality from the atomic negatively charged electrons, which shows te atomic internal structure of the original house also shows that there is something positively charged, they and electronics carried by the negatively charged atoms neutral.