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→Key Stage 5
==Key Stage 5==
===Meaning===
The '''elementary charge''' ('''e''') is the [[Electrical Charge|charge]] of a [[proton]], +1.60x10<sup>-19</sup>[[Coulomb]]s.
===About The Elementary Charge===
: The [[W-boson|W<sup>+</sup> boson]], [[π-meson|π<sup>+</sup> meson]] and [[K-meson|K<sup>+</sup> meson]] all carry the '''elementary charge''' (+1.60x10<sup>-19</sup>[[Coulomb]]s).: The [[electron]], [[W-boson|W<sup>-</sup> boson]], [[π-meson|π<sup>-</sup> meson]] and [[K-meson|K<sup>-</sup> meson]] all carry an [[Electrical Charge|charge]] the same [[magnitude]] as the '''elementary charge''' but with the opposite sign (-1.60x10<sup>-19</sup>[[Coulomb]]s).
: During the [[Weak Nuclear Interaction|weak interaction]] both [[quark]]s and [[lepton]]s can change in [[Electrical Charge|charge]] by a [[magnitude]] of the '''elementary charge'''.
: The [[electronvolt]] is a [[unit]] of [[energy]] used for [[Subatomic Particle|subatomic particles]] and can be calculated by dividing the [[energy]] in [[Joule]]s by the magnitude of the '''elementary charge'''.
===Subatomic Particle Charges as a fraction of Elementary Charge==={| border="1" styleclass="border-collapse:collapsewikitable"
| style="height:20px; width:250px; text-align:center;"|[[Subatomic Particle|Particle]]
| style="height:20px; width:250px150px; text-align:center;"|[[Electrical Charge|Charge]]/'''e'''
|-
| style="height:20px; width:250px; text-align:center;"|[[Proton]] (<math>p</math>)
| style="height:20px; width:250px150px; text-align:center;"|<math>+1</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[Electron]] (<math>e</math>)
| style="height:20px; width:250px150px; text-align:center;"|<math>-1</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[Muon]] (<math>\mu</math>)
| style="height:20px; width:250px150px; text-align:center;"|<math>-1</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[π-meson|π<sup>+</sup> meson]] (<math>\pi^+</math>)
| style="height:20px; width:250px150px; text-align:center;"|<math>+1</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[π-meson|π<sup>-</sup> meson]] (<math>\pi^-</math>)
| style="height:20px; width:250px150px; text-align:center;"|<math>-1</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[K-meson|K<sup>+</sup> meson]] (<math>K^+</math>)
| style="height:20px; width:250px150px; text-align:center;"|<math>+1</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[K-meson|K<sup>-</sup> meson]] (<math>K^-</math>)
| style="height:20px; width:250px150px; text-align:center;"|<math>-1</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[Up-quark]] (<math>\nuu</math>)| style="height:20px; width:250px150px; text-align:center;"|<math>+\frac{2}{3}</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[Down-quark]] (<math>\nud</math>)| style="height:20px; width:250px150px; text-align:center;"|<math>-\frac{1}{3}</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[Strange-quark]] (<math>\nus</math>)| style="height:20px; width:250px150px; text-align:center;"|<math>-\frac{1}{3}</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[Top-quark]] (<math>\nut</math>)| style="height:20px; width:250px150px; text-align:center;"|<math>+\frac{2}{3}</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[Bottom-quark]] (<math>\nub</math>)| style="height:20px; width:250px150px; text-align:center;"|<math>-\frac{1}{3}</math>
|-
| style="height:20px; width:250px; text-align:center;"|[[Charm-quark]] (<math>\nuc</math>)| style="height:20px; width:250px150px; text-align:center;"|<math>+\frac{2}{3}</math>
|}