(free points) is a subatomic particle of an atom the smallest unit of matter? or is and atom the smallest part of matter?

subatomic matter is not the smallest unit of matter, but its definetely smaller than atom. fernions which form subatomic particles is the smallest unit of matter.

An atom is the smallest unit of matter. It is the smallest component of an element that still has the properties of that element. Atoms are made of three particles. protons, neutrons, and electrons.

i'm assuming that it's c.) red bank..

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.