I believe that would be the electron.
Edit by Ylesrinne
Not quite. Electrons are made of quarks, which are smaller than electrons allong with muons, gloums, leptoms, femioms, tracheons, among others.
The atom is the smallest known particle.
yes this is called an atum a atum is a the smallest thing known to man some people say this is not true but it is there is no such thing as atum's butt it is a living particle on an animal or living breathing oganism thank you Alyce D
A quark is the smallest particle in matter.
observable ? i'd say quarks.
An atom is the smallest particle of a substance.
The smallest particle of an element is called an atom.
you can't get mass you can acquire it mass is govern by a particle known as the Bassa Nova Higgs the smallest particle in the mutiverse or universe.
The smallest particle in the atom is the electron.
Of those three the electron is the least massive.
Atoms are NOT the smallest particle- they are the smallest COMPLETE particle. In an atomic reaction, the atoms are broken apart, and release energy.
A molecule is the smallest particle of a compound that still retains its properties. An atom is the smallest particle of an element that still retains its properties.
Physicists are currently trying to find proof of the Higgs-Boson particle, also known as the God Particle. This particle is the fundamental unit of everything that contains mass in the universe.