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Infobox
Test1
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Test2
{{Infobox particle
|name = Electron
|image = 
|caption = Hydrogen atom orbitals at different energy levels. The brighter areas are where you are most likely to find an electron at any given time.
|num_types =
|composition = Elementary particle<ref name="prl50"/>
|statistics = Fermionic
|group = Lepton
|generation = First
|interaction = Gravity, electromagnetic, weak
|antiparticle = Positron (also called antielectron)
|theorized = Richard Laming (1838–1851),<ref name="farrar"/>
G. Johnstone Stoney (1874) and others.<ref name="arabatzis"/><ref name="buchwald1"/>
|discovered = J. J. Thomson (1897)<ref name="thomson"/>
|symbol = Template:SubatomicParticle, Template:SubatomicParticle
|mass = Template:Val<ref name="2010 CODATA" />
Template:Val<ref name="2010 CODATA" />
[[[:Template:Val]]]−1 u<ref group=note>The fractional version's denominator is the inverse of the decimal value (along with its relative standard uncertainty of Template:Val).</ref>
Template:Val<ref name="2010 CODATA"/>
|electric_charge = Template:Val<ref group=note>The electron's charge is the negative of elementary charge, which has a positive value for the proton.</ref>
Template:Val<ref name="2010 CODATA" />
Template:Val
|magnetic_moment = Template:Gaps<ref name="2010 CODATA" />
|spin = Template:Sfrac
| mean_lifetime = stable ( > Template:Val<ref name=bx2015>Template:Cite journal
