Quarks are the smallest.
A nanometer is a unit of length, 1\/100,000 of a millimeter, about the diameter of an atom, and a quark is smaller. Atoms are protons, neutrons and electrons put together, and inside the protons, neutrons and electrons are quarks. As for nanometers, 1nm=1^-9m, the diameter of different elements must be different, so it is very inaccurate to say that 1nm is 4 times the size of an atom, and the diameter of a hydrogen atom is 0.1nm.
charge
Quarks have a fraction of their charge -- 2 of their basic charge. 3 times or -1? Triple, depending on the taste. The charge of the top, charm and top quarks (these three are called \"top quarks\") is 2. 3, and the charge of the lower, odd and bottom quarks (these three are called \"lower quarks\") is? 1? 3. The antiquark is the opposite of its corresponding quark charge: the charge of the upper antiquark is? 2? 3, and the lower antiquark has a charge of 1? 3.
The smallest unit is the quark. Quarks are elementary particles that participate in strong interactions and are also the basic units of matter. Quarks combine with each other to form a composite particle called a hadron. The most stable of the hadrons are protons and neutrons, the building blocks of the atomic nucleus.