1. What is an atom?
Grade 10 ST

2. What is an Atom? Can an atom be broken into a smaller piece?
NO. Atoms are the smallest particles.
It cannot be divided chemically
How small is the smallest particle?
Some perspective:
A sheet of paper is a million atoms.....THICK
A drop of water can contain 1022 atoms
. A period has a diameter of at least 50 trillion atoms lined up in a row

3. Democritus
His theory stated that the smallest unit of mater was the atom!
Today we know this be true!
Like building blocks atoms come together to form all substances in our environment.

4. Atoms Atom from the greek atomos “indivisible”
Molecular Theory of Matter states that all matter is composed of small, fast moving particles called atoms. These atoms can join together to form molecules.
This theory is really thousands of individual theories that provide evidence for the whole theory.
Since the atom is too small to be seen even with the most powerful microscopes, scientists rely upon models to help us to understand the atom.

5. Atomic Model Much contemplation
As we continue to learn and make advancements scientists continue to make changes to the atomic model

6. What do you think?
Compare each of the atomic models to an object in your everyday life. Be creative!