| Type | Generation | Energy | Mass |
|---|---|---|---|
| up down | first | low - up quark: 2 million electron volts | lightest |
| strange charm | second | higher | higher |
| bottom top | third | highest - top quark: 170 billion electron volts | heaviest |
The bottom and top quarks were only found in 1995.
http://www.sixtysymbols.com/videos/quarks.htm
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