Acids, Bases, and SaltsThe pH Scale Acidity is a chemical property of a substance. It is measured using the pH scale, which is based on the ratio of...
The Periodic TableThe Periodic Table The arrangement of sub-atomic particles in an atom not only affects the identity of the element, but also its physical...
ElementsTypes of Atoms While all atoms are made of the same three sub-atomic particles, the quantity of these sub-atomic particles can vary,...
AtomsEarly Atomic Theory Sometime around the year 400 BC, a Greek philosopher name Democritus developed a new theory about what matter is made...