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electron
subject			fact

electron	has antiparticle positron
	has charge -1
	is a part of element
	has definition Negatively charged fundamental particle (also called a beta particle) found in the atoms of all elements, where it "orbits" (at different energy levels and with different directions of spin) round the central nucleus. The combined charge of the orbiting electrons is balanced (in a neutral atom) by the charge of an equal number of positively charged protons in the atomic nucleus. An electron is also the fundamental unit of electricity.
	has definition A small, negatively charged particle that appears in every neutral atom, surrounding the positively charged nucleus like bees around honey.
	has definition A negatively charged spin-1/2 particle, which interacts via the electromagnetic, weak and gravitational forces. It has a mass of 0.511 MeV / c2, some 1800 times lighter than the proton.
	has definition A lepton with an electric charge of -1. An electron is also a fermion because it has a spin of one half.
	has definition A stable, negatively charged elementary particle - the lightest massive particle known. The classical electron radius is 2.82 × 10-13 cm; me = 9.1 × 10-28 g = 5.48597 × 10-4 amu. The electron family (see lepton) includes the electron e-, the positron e+, the electron neutrino νe, and the electron antineutrino νebar. Rest-mass energy of electron 8.186 × 10-7 ergs. Electron charge = 1.60219 × 10-19 coulombs.
	has definition Light elementary particle with a negative electrical charge. Electrons are found in shells surrounding the nuclei of atoms; their interactions with the electrons of neighboring atoms create the chemical bonds that link atoms together as molecules.
	is a kind of lepton
	is a kind of charged particle
lepton	has spin 1/2
charged particle	is accelerated by electric or magnetic fields
fermion	has quantum behavior Fermi-Dirac statistics
	obeys exclusion principle
particle	obeys uncertainty principle
	has frequency inversely proportional to the wavelength
	has wavelength inversely proportional to its momentum
	has mass
physical object	has location or center of gravity
	has angular momentum
	has velocity
	has momentum
	has temperature
	has volume
	has extent
	has material

Kinds of electron :

• beta-particle (3 facts) - An electron or a positron emitted from an excited nucleus when it returns to its ground state via β-decay., Particles first discovered in radioactive β decay - later identified as electrons.
• bound electron (5 kinds, 17 facts) - Zone in which the electron in atoms reside. Its radius is determined by the quantum principle, its population by the exclusion principle.
• free electron (1 kind, 4 facts) - Electron not bound to a nucleus.

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