BASIC ATOMIC THEORY
Atom: basic building block of the universe. All maters is composed of atoms. Atom is the smallest part of any element.
Atoms are composed of three principal parts:
- The electron (-)
- The proton (+)
- The neutron (0)
Is is believed that the electron is approximately three times larger than a proton, but the proton weighs approximately 1840 times more than an electron.
THE LAW OF CHARGES
This law of physics states that opposite charges attract each other and like charges repel each other.
- If electrons were to meet other electrons, they will repel from each other.
- If protons were to meet other protons, they will repel from each other.
- If electrons and protons were to meet each other, they will attract each other.
STRUCTURE OF THE ATOM
Nucleus is the center of the atom. It is composed of protons and neutrons.
Electrons exist around the nucleus in shells.
Valence electrons are electrons that exist in the outermost shell.
The valence shell of an atom cannot hold more than eight electrons.
It is the valence electrons that are of primary concern in the study of electricity, because it is these electrons that explain much of electrical theory.