Question

Hi all this is a question about nuclear physics. I understand that an atom is made up of neutron,proton(nucleus) and electron, but where does particles like Positron,Neutrino etc fit into, are they particles outside an atom ?

Answer 1

http://en.wikipedia.org/wiki/Positron

Answer 2

There was a time long back when atom was thought to be indivisible. However later research showed it to be composed of electrons, protons and neutrons. After their discovery, even these three particles were considered indivisible.

When physicists first began using accelerators in the 1950s and1960s, they discovered hundreds of particles smaller than the three well-known subatomic particles -- protons, neutrons and electrons. As bigger accelerators were built, ones that could provide higher energy beams, more particles were found. Most of these particles exist for only fractions (less than a billionth) of a second, and some particles combine to form more stable composite particles. Some particles are involved in the forces that hold the nucleus of the atom together, and some are not. In examining this complicated picture, a standard model of the atom has emerged.

Answer 3

I think they are basically particles that behave like electrons but behave in the opposite way, and if they ever met an electron both would be annihilated.

Answer 4

According to this model, matter can be divided into the following building blocks:

Fermions - subatomic particles that make known matter and antimatter
matter
leptons - elementary particles that do not participate in holding the nucleus together (examples - electron, neutrino)
quarks - elementary particles that do participate in holding the nucleus together
anti-matter - counter-particles of quarks and leptons (anti-quarks, anti-leptons)
Hadrons - composite particles (examples - proton, neutron)
Bosons - particles that carry forces (four known types)

Answer 5

http://www.krysstal.com/subatomic.html

If u r interested in details, visit the above site...

Answer 6

So positrons exist in antimatter, it usually doesnt exist for long because it meets up with an electron and gets annihilated. It isnt part of the atoms you find floating around the universe.
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Answer 7

NVM I thought Harkirat was the person asking the question...

Answer 8

The crazy thing is that no one knows where the antimatter is. Where did it go after the big bang? Maybe there was one slight difference which made the matter much more prevalent, but I think that isn't found yet.

Answer 9

no man..all paricles neutron,positron inside the center..and we know about only some of them..there are many other particles inside them..