The current version of the quark model calls for six different quarks named, up (u),down (d), top (t), bottom (b), strange (s), and charm (c). The important feature of the quarks is that (d,s,b) have (-1/3)e and (u,t,c) have (+2/3)e, where e is charge of the electron whichis the smallest charge in existence. Each quark has a property called color, that has nothing to do with usual definition of color. The color property of quarks can have three “values”, red, green, and blue. There are then 18 quarks. Each one of the eighteen quarks has an antiquark. An antiquark has the same mass as its corresponding quark, but some of the other properties
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