The best replacement for electron is light microscope.

The best alternatives to electron are rated as following:
★★★★★  light microscope
★★★★  proton
★★★  photon
★★  proton mass
★★  positron
★  hole
★  neutron
★  atom
★  ion
★  visa
★  light microscopy
★  proton size
★  solo
★  atom smaller
★  proton heavier
  visa debit
  bastion
  light microscopes
  transmission electron microscope
  proton\/

Your alternative for electron is not listed? Suggest!
Speaking about electron, one probably shouldn't forget about two elements.

Other search terms related to electron and their ratings are:
★★★★★ two elements
★★★ nucleus
You have in mind a companion for electron and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of electron in all years. Click on graph for more.
electron
light microscope
proton