It's an atom because that contains a nucleus with the defining number of protons (plus some neutons) and the defining number of electrons, e.g. 12 protons/electrons makes it carbon.
The smallest unit of Matter that retains the property of an element is the atom.
The atom.
The smallest particle of matter that retains the properties of the element of which it is a sample.
The smallest part of all matter has been identified to be a "quark."
A quark is the smallest particle in matter.
The smallest particle of matter that retains the properties of the element of which it is a sample.
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 smallest part of any chemical element that can exist is an atom of that element. The smallest part of a chemical compound that can exist is a molecule of that compound.
An atom of an element or a molecule of a compound.
because matter is not made up of particles so an aton is the smallest thing! :)