Light is currently considered to be the fastest known particle(s) in existence. There are theoretical particles that can function well past the speed of light. One example of such theoretical particle is the Tachyon.
The past participle of "show" is "shown." It is used in perfect tenses, such as in the sentence "She has shown great talent." Another form, "showed," is the simple past tense.
Now the term negatron is not used; in the past was rarely used to name an electron or an antiproton.
an alpha particle
A colloid is not a subatomic particle.
Past is : Beat (itself) Past Particle : Beaten
The simple past and past participle is had.
"Encouraged" is the simple past and past participle of the verb "encourage".
The past participle for shrink is shrunk.shrink / shrank / shrunk
The past participle of do is 'done'.
The past participle is burst.
The past participle is drawn.
Been
The past participle (and simple past) is loved.
infinitive: be past: was/were past participle: been
The past tense is took. The past participle is taken.
Lied is the past form of lie.