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==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'''.