Once upon a time the Greek philosopher Democritus (450-370 BC) proposed that matter consisted of indivisible small particles called atoms, and that they were the fundamental particles of which all matter was made,
This was opposed to the conventional view of his day that there were four fundamental substances: fire, earth, water and air, from which everything else was made. A view that persists in astrology in which the 12 signs of the Zodiac are thought of as 3 Fire signs, 3 Earth signs, 3 Air signs and 3 Water signs,
Democritus' view prevailed. And so the matter rested till the start of the 20th Century.
Ernest Rutherford conceptualised that atoms had a nucleus. Niels Bohr that they had electrons circling that nucleus. The neutron was first discovered in 1930, And the possibility that the atom (or, more precisely, the nucleus) could be split and transmuted into an atom of another element in the process was realised, Lise Meitner and Otto Hahn were the first to achieve this, and nuclear fission had thereby been discovered. And it was realised that atoms were not indivisible, after all.
The basic model of a nucleus containing neutrons and protons, with electrons whirling atound outside it was then widely accepted. And protons, neutrons and electrons were seen as the indivisible fundamental particles of which all matter was made.
Quarks came later. The initial work on the theory was done in 1961. There are six kinds of quark called Up, Down, Top, Bottom, Strange, and Charm. They combine in trios to make protons and neutrons.
Quarks are the only fundamental particles that interact through all four of the fundamental forces. The derivation of this word comes from the book Finnegans Wake by James Joyce, where seabirds give "three quarks", akin to three cheers, and probably just take on the sound a seabird makes, like "quack" is for ducks.
An important property of quarks is called confinement, which states that individual quarks are not seen because they are always confined inside subatomic particles called hadrons (e.g., protons and neutrons),
And quarks (with leptons) (collectively known as fermions) are now regarded as the indivisible fundamental particles of which all matter is made, Anyone getting a sense of deja vu?
2006-10-05 17:15:19
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answer #1
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answered by Anonymous
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the nucleus, which is made up of the protons and neutrons of the atom
EDIT: Yeah guys, "atom" is the name for the entire entity. I thought it was most appropriate to name the sub-entity rather than the parts that make up the sub-entity. Don't forget, electrons are even SMALLER than quarks. :P
2006-10-05 19:02:47
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answer #2
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answered by Anonymous
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Quark
2006-10-05 19:10:49
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answer #3
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answered by mbah marijan 3
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The photon is the commonly known smallest particle smaller than an atom
2006-10-05 19:24:33
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answer #4
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answered by latif_1950 3
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Actually,there's three:the proton,the neutron,and the quark.
2006-10-05 20:24:27
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answer #5
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answered by That one guy 6
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out side the atom u find electrones
inside u find protones and neutornes
electrones are made of quarkes
2006-10-05 19:21:40
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answer #6
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answered by koki83 4
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there are sub elementary particles that are even smaller that proton and neutrons.
Quarks, bosons and mesons.
2006-10-05 19:09:05
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answer #7
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answered by Morey000 7
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Quark is the smallest one.
2006-10-06 09:58:42
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answer #8
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answered by Anonymous
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and there is something smaller than nucleus,
and thats one thing form the nucleus made form, lol!
2006-10-05 19:06:44
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answer #9
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answered by Hitman 2
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Your brain?
2006-10-05 19:51:12
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answer #10
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answered by Bubba 2
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