The smallest part of an element that contains all of the properties of that element.
The atomic number is equal to the number of protons (positively charged particles) in the nucleus of an atom.
A negatively charged particle.
The simplest form of matter.
The smallest part of a compound that is made of individual atoms.
The center portion of an atom containing the protons and neutrons.
A positively charged atomic particle.
The outermost ring of electrons in an atom. Used to determine whether an element is an insulator, conductor or semiconductor.