# Discussion on Structure of Atom

Posted on: 05:33:04 PM on June 7, 2014
if atom moves with speed of light then what will happen to electron

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## Reponses To This

Posted on: 02:14:05 PM on June 8, 2014
do you know how much is electron speed?

Posted on: 05:53:46 AM on June 10, 2014
As fast as you can get them going! Well not quite. One of the facts of life discovered in the 20th century is that the speed of light (300,000 kilometers per second) is the ultimate speed limit. As you add energy to the electron, it will go faster, but as you get it to go close to the speed of light, you find that you have to add even more energy just to bump it a bit faster. For example, with just over 220,000 eV (which stands for a convenient unit of energy called the "electron-volt"), you can get the electron up to 90% of the speed of light. But to get it to 99.9% (just another 9.9%), you need a total of over 11 million eV! One way of looking at this is that the electron gets "heavier" (more massive) as it goes ever faster. So it's harder to push it faster. At Jefferson Lab, a typical energy for the electrons in the beam is 4 GeV which is 4 billion eV. That means the electron is traveling at 99.9999992% of the speed of light. Close but still not 100%.

Posted on: 03:16:50 PM on August 31, 2017
Quite simply electrons do not and cannot move at the speed of light, so the question does not arise. In addition, thinking of electrons as somehow moving in orbit around the nucleus of an atom is misleading. Whilst it is true physicists talk of electron orbitals, which gives the impression of a solar-system type model for an atom, this is just an unfortunate hang-over from a long-defunct model. The electrons in orbitals around a nucleus are modelled using wave-functions and that can be viewed in one sense as a smeared-out probabilistic model of where the electron might be (although even that has issues). In any event, it’s not a good idea to take the idea that electrons are point-like particles in orbit around an atom. (If that was the model, the electron would radiate electro-magnetic energy and fall into the nucleus - which it doesn’t).

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