When multiple electrons move around the nuclear, the repulsive forces between them are too strong and cannot be ignored, which will definitely destabilize the atom. Our solar system is stable because these planets are far enough apart, compared with sun's attraction, the attractive force between planets are almost ignored. The magnitude of the repelling force is in the same level with the centripetal force, this must make the helium atom unstable. The reason is simple: because there is also a great force between the two electrons. One electron Hydrogen atom is OK based on this scenario.įor helium atom with two electrons, this model can not provide mechanical stability, that is, two electrons can not exist stably around the nucleus. This is a model that physicists draw from the analogy of the solar system's planetary models. Hydrogen atom is a coincidental exception, because it has only one electron.Īccording to Coulomb's law, the electrical force between proton and electron provides centripetal force, which enables the electron to run in orbit. The atomic system based on this model has no mechanical stability, atoms can not exist this way. For example it's not suitable for Helium atom with two electrons. We all know that the Bohr model is only suitable for single electron hydrogen atom, not suitable for other atoms. Bohr atom model is still the textbook content of today's high school physics.
0 Comments
Leave a Reply. |