concept of quarks.

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A quark has no internal structure but it is supposed to be fundamental constituent of matter.Quarks have fractional charge(i.e Q≠ne).Their are 6 flavours of quarks
1. Up quark(u)
2. Down quark(d)
3. Strange quark(S)
4. Charm quark(C)
5. Bottom quark(b)
5. Top quark(t)
★The number of quarks is always conserved in all interactions. Quarks are unstable & therefore, they have been ever observed as free particles.They are always found confined in baryons & mesons.

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