Isotopes are different forms of the same element which have the same number of protons but differ in their number of neutrons. A variation in the number of neutrons in the nucleus causes the atom’s mass t […]

The Basic Structure of the Atom: Atomic Structure
Atomic Structure: All atoms consist of a nucleus which contains two types of subatomic particles - protons and neutrons. The nucleus is surrounded by a […]

What is an Atom?
When starting your lesson on Atoms and Molecules make sure to start with the Atom and the changes that have been discovered. Atoms are the simplest building block of matter. Originally, it […]

Kinetic Molecular Theory of Matter
Matter is made up of particles which are in constant, random motion. It can be defined as anything which has mass or occupies space. Matter is classified by its state and […]

The Chemistry of Life: An organism can be broken down into smaller levels of organization. These levels are pictured below.

The Chemical Level
The smallest level of organization is called the […]

Science is a broad subject encompassing the living world, the material world, physical phenomena, planet earth and space. The word science comes from the Latin word “scientia” or “sciens” which means “to kno […]