It depends on the matter. If it is a chemically pure substance that is made up of a single element, it is an atom. If it is an ionic or molecular compound, then the smallest particle that has the same behavior is a molecule.
Unclear question.
At the particle physics quantum mechanics level all fundamental particles (e.g. electrons, muons, photons, neutrinos, quarks) of a given type are identical and completely indistinguishable. Even the compound particles (e.g. protons, neutrons, mesons) are difficult to tell apart.
The atom for elements, the molecule for compounds.
Atom
A quark is the smallest particle in matter.
Yes it is, it's the smallest particle of matter
developed the idea that the atom was the smallest particle of matter
The smallest particle of matter that retains the properties of the element of which it is a sample.
This is the definition of a molecule.
An atom is the smallest building block of matter that retains the characteristics of that matter.
An atom is the smallest building block of matter that retains the characteristics of that matter.
An atom is the smallest building block of matter that retains the characteristics of that matter.
An atom is the smallest building block of matter that retains the characteristics of that matter.
The atom.
A quark is the smallest particle in matter.
That would be an atom. Atoms go down to protons, neutrons and electrons, but these do not have unique characteristics. So, the smallest particle with unique characteristics is an atom.
The smallest particle of matter still retaining the elemental properties of matter is an atom. Atoms have building blocks, and they are protons, electrons and neutrons. But the atom, because it is made of these elemental building blocks, is the furthest we can break matter down and retain the elemental structure.We can further break down the building blocks of matter, the particles that make up the atom, but the resultant particles are not stable. They spontaneously go through changes and disappear.It is not an atom it is a quark
An atom
subatomic particle
The atom is the smallest known particle.
This particle is the atom.