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The Smallest unit of an covalent bond is a molecule
a solid
is the smallest particle of an element that has the properties of that element
For covalently bonded particles, the smallest identifiable unit of a compound is a molecule. For ionic compounds, the smallest identifiable unit of a compound is a formula unit.
The Standard Model of Particle Physics gives a good list of particles and their masses.
COLLOIDS
The smallest particles in a compound are electrons.
The smallest particles of matter are the atom particles, namely protons, neutrons, and electrons. The electron is the smallest of the three.
The smallest components KNOWN so far are the quarks, and leptons (which include electrons). It is still possible that these are made up of smaller particles.
Atomos is the name Democritus gave the smallest particles.
In the atom the electron is the smallest.
Of the three basic particles that atoms are made of, the electron is the smallest.
The names of the particles that make up soil from the smallest to the largest particles are clay, silt, and sand.
A solution has the smallest particles, of the mixtures that you list.
clay has the smallest particles
An atom is the smallest particle of a substance.
The smallest units of matter are the subatomic particles.