what is the meaning of quarks?
106790
< quark >   \n \nAny of a group of six elementary particles having electric charges of a magnitude one-third or two-thirds that of the electron, regarded as constituents of all hadrons.\n\nIn particle physics, quarks are subatomic particles thought to be elemental and indivisible. They are one of the two kinds of spin-? fermions (the other being the leptons). Objects made up of quarks are known as hadrons; well known examples are protons and neutrons.
1115830
Most micro-subatomic particles (i.e. Quarks, Muons, Leptons etc.) are, for the most part, the same size.  Some are a little larger than others are largly the same.  The smallest thing in existance however, is a string.  A string is not a particle though.
1008396
positively charged protons (in the nucleus), neutrally charged neutrons (also in the nucleus) and negatively charged electrons (which circle around the nucleus) ....also they have "discovered" other matter in the atom called quarks and a couple other similarly named items....but it is generally accepted that protons, neutrons, and electrons make up an atom....
1039705
The cell is still made up of many atoms, thats the only irrefutable link there. And the atom is not the elementary essential of matter, if by elementary essential you are referring to the smallest constituent of a matter. Atom is made of of sub-particles: protons, electrons, neutrons, quarks... And these are further made up of smaller sub-particles (our knowledge are always limited). Proton and nuetron have masses and volumes. Doesnt that mean they are matter too?
972
Protons and neutrons are the primary constituents of atomic nuclei, but these bits of matter can be further divided into quarks.  Quark come in six types, or "flavors:" up, down, strange, charm, top and bottom (or, if you prefer, truth and beauty.) Quarks are never observed by themselves, but are instead found in groups of two (mesons) or three (baryons). Nuclear particles are baryons -- neutrons are composed of two down quarks and an up quark (ddu), while protons are two up quarks and a down quark (uud).  The other four types of quarks are less stable, and tend to be observed only as components of high-energy, short-lived particles inside supercolliders, bubble chambers, and the like.\n\nProtons and neutrons are thus the only directly observable particles within the nucleus.  However, they are bound together by another type of particle, not directly detectable that appropriately enough is known as a gluon.  Gluons, like photons, are force-carrier particles, and they are the intermediary for the transmission of the weak nuclear force, which binds the positively charged protons and electrically neutral neutrons.
888560
a nucleus, containing protons and neutrons  and around that nucleus, there are electrons. [Although it more correct to speak of electron clouds, as they are not really localized. ]
436139
yes, Each proton and each neutron contains three quarks.There are several varieties of quarks. Protons and neutrons are composed of two types: up quarks and down quarks.\n\nEach up quark has a charge of +2/3.\nEach down quark has a charge of -1/3.\nThe sum of the charges of quarks that make up a nuclear particle determines its electrical charge. \n\nbut string theory proposes that it gets smaller than quarks a lot smaller. it is interesting and cool to look into.
802673
Hi. One of the strangest is the 'pentaquark', a short lived particle made from five quarks. : http://www.answers.com/main/ntquery?s=pentaquark&gwp=16
859901
Aside from the fact that particles having opposite electrical charges do NOT constitute the definition of "anti-matter", you also do not find free quarks roaming around, so it would be difficult for any quark to find another quark of opposite charges. By "free quark", I mean quarks that are not confined inside a proton, neutron, or other massive particles made from quarks. The reason we don't find free quarks is because the "Strong" force (which is responsible for keeping the atomic nucleus together and also for keeping quarks confined) is a force whose strength grows stronger as the particles gets further apart. That's right! This is exactly the opposite of all other forces.
80973
They are real particles.  They really exist.  The two types are mesons and baryons.  Mesons are made of one quark and an anti-quark.  Solid matter we touch in every day life is made up of atoms made of protons, neutrons, and electrons.  Protons and neutrons are two kinds of hadrons called baryons, made up from the same particles (quarks) that make up mesons, except protons and neutrons are made up of 3 quarks.  Unlike protons and neutrons, mesons are unstable, so they quickly decay.  But they can be produced and studied in particle colliders, such as the Tevatron at Fermilab, and other big colliders at the Stanford Linear Accelerator Collider (SLAC), and at Cornell.  Have a look at the following websites for more info:\n\nhttp://www2.slac.stanford.edu/vvc/theory/hadrons.html\nhttp://www.fnal.gov\nhttp://www.slac.stanford.edu
465055
A photon is a quark, yes-it isnt made of quark(s), it is a type of quark.
792343
An atom is made up of electrons, protons and neutrons\n\nProtons are made of two Up and one Down Quarks. The neutron is made of two Down and one Up Quarks.\n\nProtons have a diameter of about 1.5×10−15 m\nNeutrons have a radius of about 0.8 × 10−15 m\nElectrons have a radius of about 3x10^-15 m\n\nQuarks must be smaller than 10^-18 m. This determination is based on the highest energy collisions currently available
319062
Gluons are the force particles of the strong nuclear force that keep the quarks together in protons and neutrons. Quarks exchange gluons between and this forces them to stick together.Compare this to a soccer team exchanging the ball between them: the players cannot be too far apart.\n\nGravitons are the force particles of gravitation. But contrary to gluons, they have not been detected.A lot of physics theory would fell apart if gravitons don't exist. \n\nGravitinos are entirely hypothetical. The arise in a theory called supersymmetry that tries to combine all four forces of nature into one.
375283
The quark hasn't yet been split, so noone knows what they are made of. It is possible that quarks aren't made of smaller particles.
680011
no one really knows yet.\n\nalthough, at one point, people thought atoms were the smallest particles, now we know about protons, neutrons, and electrons (and now there's a theory that they're made out of something called quarks, but no one really knows what they are)... it's only a matter of time until we find out what they're all made of... and what those things are made of... and what those things are made of... and so on (I seriously doubt it ever ends... like the universe)
168218
Atoms are combinations of protons and neutrons with electrons flying around. They form the basic "elements" of matter.\n\nThe nucleus of an atom has protons and neutrons (except for hydrogen which has one proton). There are about the same number of protons and neutrons in each nucleus, although for larger nuclei (like uranium) there are more neutrons.\n\nAll of these particles have a variety of specific characteristics. For example an electron has a negative charge and a proton has a positive charge, while the neutron is neutral. The charge of the proton and electron are identical except for the sign.\n\nProtons and neutrons are both made of quarks. A proton has two "up" quarks and one "down" quark, while the neutron has two "down" quarks and one "up" quark. (The up and down are just names for these two types of quark, there is no physical significance to the name. They could have selected \nChocolate and Vanilla instead.)\n\nProtons and neutrons are almost always described as being composed of three quarks, but there are also gluons running around. Gluons are the particles which control the interaction of quarks within a proton or neutron. They carry the force that binds the three quarks together to form the larger particle.\n\nSo a proton or neutron has three quarks and a cloud of gluons.\n\n(Just as an aside: If one combines a proton and an electron and a neutrino you will get a neutron, but, in the oddness of quantum physics that doesn't mean a neutron is made of these little guys.)\n\nElectrons on the other hand seem to have no consituents, at least down to the level that has been probed with modern instruments.
473847
Charm quarks were first seen, and are most commonly observed, in the production of the J / psi particle, which is the lowest mass bound state of charmonium (a c/anti-c quark combination).  As with any quark, you'll never see one unbound (for reasons I won't go into here).\n\nIf by 'seen' you mean 'observed', then the above particle was first seen in a particle chamber at SLAC and at Brookhaven - and any observation which provides information about quark composition of particles will also take place in a particle chamber of some kind, as only they are capable of tracking particle motion - and it is the specific forms of particle tracks which allow us to identify quark composition.