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→About Quarks
===About Quarks===
: The '''quark''' is denoted with a lower case '''q'''.
: '''Quarks''' are believed to be [[Fundamental Particle|fundamental particles]] but they have never been observed on their own.
: '''Quarks''' always exist as part of [[hadron]] including a [[baryon]], which is a triplet of [[quark]]s or a [[meson]] which is a [[quark]]-[[antiquark]] pair.
:*[[Down-quark]] (d) - With a [[Electrical Charge|charge]] of <math>-\frac{1}{3}</math>[[Elementary Charge|e]], two of which are found in a [[neutron]] and one of which is found in a [[proton]].
:*[[Strange-quark]] (s) - With a [[Electrical Charge|charge]] of <math>-\frac{1}{3}</math>[[Elementary Charge|e]] which [[Radioactive Decay|decays]] quickly via the [[Weak Nuclear Interaction|weak interaction]] into a [[down-quark]].
(The following are not on all A-level syllabi)
:*[[Top-quark]] (t) - With a [[Electrical Charge|charge]] of <math>+\frac{2}{3}</math>[[Elementary Charge|e]] which [[Radioactive Decay|decays]] quickly via the [[Weak Nuclear Interaction|weak interaction]].
:*[[Bottom-quark]] (b) - With a [[Electrical Charge|charge]] of <math>-\frac{1}{3}</math>[[Elementary Charge|e]] which [[Radioactive Decay|decays]] quickly via the [[Weak Nuclear Interaction|weak interaction]].