Atomic theory - Page 1
Forum section: electronics / beginners

author: umamahesh
author_rank: Newbie
timestamp: October 20, 2013, 01:31:27 pm
content: I am not understanding that how protons in the nucleus do not repel away from each other as they are the same charge. can any of you experts please explain it.

author: MichaelW
author_rank: Contributor
timestamp: October 20, 2013, 01:44:25 pm
content: I don't know the details, of course, a physicist would, but it's due to one of the 4 fundamental forces of nature: the strong nuclear force. That's the force that holds the nucleus of an atom together. Without it every atom in the universe would explode! :-)

author: adnewhouse
author_rank: Contributor
timestamp: October 20, 2013, 01:45:48 pm
content: Not an expert...But when the protons and the neutrons in the nucleus are so close they have something called the strong force. This is when protons and protons, neutrons and neutrons, and neutrons and protons are attracted to each other. This force is only apparent when the sub atomic particles are very close to each other like in the nucleus. It is strong enough to overcome the "positives repel positives rule".

author: Dr. Frank
author_rank: Super Contributor
timestamp: October 20, 2013, 01:49:51 pm
content: Quote from: umamahesh on October 20, 2013, 01:31:27 pmHello,in todays physics, we distinguish 4 different elementary forces:http://en.wikipedia.org/wiki/Fundamental_interactionThe Strong Interaction between the particles (protons, neutrons) in the atoms nucleus is effective over very small distances only, and overrules the repelling electromagnetic force of the protons.Frank

author: KD0CAC John
author_rank: Frequent Contributor
timestamp: October 20, 2013, 02:12:08 pm
content: Micro / macro , inside / outside or the electron valance or atomic / subatomic .The strong & weak forces are on either side of the electron valance - where the electrons orbit the nucleus .The rules change between atomic & subatomic .At least off the top of a bad memory and what I think I may or may-not know

author: Stonent
author_rank: Super Contributor
timestamp: October 20, 2013, 07:45:49 pm
content: In some cases the nucleus will eject a proton, but it will also take a neutron with it. This is known as a Helium nucleus or Alpha particle.The strong force that holds the nucleus together has a force of about 137 times stronger than the electromagnetic force which comes in to play when dealing with + and - attraction and repelling. But the range of the strong force is only about 10E-15 meters or the size of a medium sized nucleus.When you get into weak force it has a force of 10E-6 in comparison to the strong force and that's where Beta decay comes into play. Then you get into other charges like W+, W- and Z.And how strong is the strong force in comparison to gravity? Gravity is 6x10E-39 as strong, but the range is nearly infinite in comparison.

author: Kryoclasm
author_rank: Regular Contributor
timestamp: October 20, 2013, 11:18:57 pm
content: Quote from: Stonent on October 20, 2013, 07:45:49 pmThat is a better answer than I was gong to give... Magic.

author: olsenn
author_rank: Frequent Contributor
timestamp: October 21, 2013, 03:08:47 pm
content: Coloumb's Law does hold for protons in a nucleus, and indeed a repelling force is felt on them; however, there is an additional force that these protons feel, which is the nuclear (or strong) force; this is an attractive force.The repulsive (Coloumb's Law) force between the two like charges is inversely proportional to the square of the distance between them. The attractive (nuclear) force falls off much more abruptly as the distance between the like particles increases. It is because of this reason that very large atoms with many protons (high atomic number) have protons far enough away from the center of the nucleus that the repulsive force becomes greater than the attractive force, and this causes those outermost protons to shoot out from the nucleus. When this happens, the material is said to be radioactive and unstable.There is a great amount of energy released as protons shoot out from the nucleus of radioactive atoms... this fact is utilized in nuclear power plants as well as atomic bombs.