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[[Up-quark]](<math>u</math>)
| style="height:20px; width:200px; text-align:center;"|<math>q=+\frac{2}{3}</math>
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| style="height:20px; width:200px; text-align:center;"|
[[Antiup-quark]](<math>\bar{u}</math>)
| style="height:20px; width:200px; text-align:center;"|<math>q=-\frac{2}{3}</math>
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| style="height:20px; width:200px; text-align:center;"|
[[Down-quark]](<math>d</math>)
| style="height:20px; width:200px; text-align:center;"|<math>q=-\frac{1}{3}</math>
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| style="height:20px; width:200px; text-align:center;"|
[[Antidown-quark]](<math>\bar{d}</math>)
| style="height:20px; width:200px; text-align:center;"|<math>q=+\frac{1}{3}</math>
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| style="height:20px; width:200px; text-align:center;"|
[[Strange-quark]](<math>s</math>)
| style="height:20px; width:200px; text-align:center;"|<math>q=-\frac{1}{3}</math>
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| style="height:20px; width:200px; text-align:center;"|
[[Antistrange-quark]](<math>\bar{s}</math>)
| style="height:20px; width:200px; text-align:center;"|<math>q=+\frac{1}{3}</math>
<math>-1 = -\frac{1}{3} + x</math>
K<sup>-</sup> has a [[Negative Charge|negative charge]]. This can be achieved with one its [[strange-quark]] with a [[Electrical Charge|charge]] of <math>-\frac{1}{3}</math>[[Elementary Charge|e]] and another [[Electrical Charge|charge]] of <math>-\frac{2}{3}</math>[[Elementary Charge|e]] (an [[antiup-quark]]).
Since <math>-1 = -\frac{1}{3} + -\frac{2}{3}</math>
Therefore <math>K^- = S s + \bar{u}</math>
A strange-antiup pair.
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