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==Key Stage 5==
===Meaning===
A '''bottom-quark''' ('''b''') is a type of [[quark]] with a [[Electrical Charge|charge]] of <math>-\frac{1}{3}</math>.
===About Bottom-quarks===
| style="height:20px; width:120px; text-align:center;"|
[[Bottom-quark]]
| style="height:20px; width:120px; text-align:center;"|<math>qQ=-\frac{1}{3}</math>
| style="height:20px; width:120px; text-align:center;"|<math>S=0</math>
| style="height:20px; width:120px; text-align:center;"|<math>b=+\frac{1}{3}</math>
| style="height:20px; width:120px; text-align:center;"|
[[Antibottom-quark]]
| style="height:20px; width:120px; text-align:center;"|<math>qQ=+\frac{1}{3}</math>
| style="height:20px; width:120px; text-align:center;"|<math>S=0</math>
| style="height:20px; width:120px; text-align:center;"|<math>b=-\frac{1}{3}</math>
| style="height:20px; width:120px; text-align:center;"|<math>l=0</math>
|}