If you meant to ask what is a quark, it's one of the basic elementary particles in what physicists refer to as the Standard Model. Electrons and neutrinos, as well as certain other related particles called "leptons", are also elementary particles. Neutrons, protons, and other mesons and baryons are made of quarks. The force holding quarks together in baryons and mesons is called the strong force, and it is... strong, that is. It's the strongest known force in the universe, and its gauge particles (force carriers) are called gluons.
On the off chance you meant it exactly as written...
In the old science-fiction TV comedy Quark, the title character was played by Richard Benjamin. In Star Trek Deep Space 9, an entirely different character named Quark was played by Armin Shimerman.
A proton can be divided into 2 Ups and a Down quark, and a neutron into 2 Downs and an Up quark. In general the quark is the elementary particle from which protons and neutron are formed.
The reason that protons are positive and neutrons have no charge is owed to the fact that quarks, which make up these particles, do not have integral charge. The charge of an up quark is +2/3, and the charge of a down quark is -1/3. When the charges of the quarks are added for the particles, we get the following: Proton = up quark + up quark + down quark = 2/3 + 2/3 - 1/3 = 4/3 - 1/3 = 3/3 = +1 Neutron = up quark + down quark + down quark = 2/3 - 1/3 - 1/3 = 2/3 - 2/3 = 0 (zero)
quark
Beta decay involves changing an up quark into a down quark (Beta+) or a down quark into an up quark (Beta-). This causes a neutron to change into a proton (Beta-) and emit a W- boson which decays into a beta particle (electron and electron antineutrino), or, with extra energy, it causes a proton to change into a neutron (Beta+) which emits a beta particle (positron and electron neutrino). Quarks are involved because protons and neutrons are comprised of quarks in sets of three, two up quarks and one down quark to form a proton, and two down quarks and one up quark to form a neutron.
The elementary particle for a neutron is called a quark. Neutrons are made up of three quarks: two Down quarks and one Up quark.
An antibottom quark (or b-bar quark) is the antiparticle of a bottom quark. It has the same mass as a bottom quark but opposite electric charge and other quantum numbers. When a bottom quark meets an antibottom quark, they can annihilate each other and produce energy.
Quark.
Neutral pions are composed of a quark-antiquark pair, specifically an up quark and an anti-up quark or a down quark and an anti-down quark. They are the lightest mesons and are unstable, decaying rapidly into two photons.
quark quark
An anti-down quark is the antimatter counterpart of a down quark, one of the elementary particles that make up protons and neutrons in the atomic nucleus. It has opposite electric charge to a down quark and can combine with other quarks to form antimatter particles.
Quark CopyDesk was created in 1991.
Quark Pharmaceuticals was created in 1993.
An anti-beauty quark, also known as a bottom antiquark, is the antiparticle counterpart of the beauty quark. It is a fundamental particle that has the opposite electric charge and other quantum numbers compared to the beauty quark. When a beauty quark and an anti-beauty quark pair up, they annihilate each other, releasing energy in the form of other particles.
Quark quark.
The final quark, the Top Quark, was discovered in 1995 at FermiLab.
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The up quark, the down quark, and the electron. Two up quarks and a down quark form a proton, and two down quarks and an up quark form a neutron.