chemistry lovers

The composition of the number of protons and neutrons in atomic nuclei greatly affect the stability of the atomic nucleus. The nucleus is said stable if the composition of the number of protons and neutrons are "balanced" and his energy levels have been in the ground state. The number of protons and neutrons and the energy levels of a stable core-core will not change as long as there is no interference from outside. In contrast, the nucleus is said to be stable when the composition of the numbers of protons and neutrons "unbalanced" or energy levels are not on the ground state. It should be noted that the composition of protons and neutrons are "balanced" or "unbalanced" above does not mean having the same number or not the same. Each nucleus has a "balance" different. , the stability of light nuclei occurs when the number of protons equals the number of neutrons. While the stability of heavy nuclei occurs when the number of neutrons the maximum 1.5 times the number of protons. Atom model proposed by Joseph John Thompson has many weaknesses, as well as the atomic model proposed by Ernest Rutherford. Rutherford atomic model could not explain the reason why the electron can not fall into the nucleus. Classical physics states that if there is a charged particle moving in curved lintsan then the energy will be lost in the form of radiation. Statement of classical physics is a problem for the model of the atom proposed by Rutherford as if the electrons moving around the nucleus, the electron will lose energy and electron kinetic energy will continue to decrease. Tensile force atomic nuclei to electrons will be larger than the centrifugal force and causes the electron trajectory path of electrons into a spiral and eventually fell into the atomic nucleus.