Why some particles have no mass even similar sized ones?

Neon
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Photon have the same size as an electron(i think) but no mass. Gluons also. WHY
 
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I meant gluons have no mass not same size
 
Neon said:
Photon have the same size as an electron(i think) but no mass.

Photons are not the same size as electrons. Technically, assigning a size to either particle is very problematic. Both are considered to be point-particles, which means they are considered to be of 'zero size', but in reality quantum effects tend to smear out the position of either particle based on their wavelength/mass.

Neon said:
WHY

That would require a very complicated mathematical description of Quantum Electrodynamics and the Higgs Field. The simple answer is that electrons simply have mass, and photons don't.
 
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