2. What is an Atom?
An atom is the smallest particle of an
element that has all the properties of
Atoms are the building blocks of
3. Structure of Atoms
Nucleus – the nucleus contains neutrons
(no charge) and protons (positive
Electrons – tiny particles surrounding
the nucleus (negative charge).
4. What is an element?
An element is a substance that cannot
be broken down any further.
They are the building blocks of matter.
Elements combine to make the world
There are only a few elements found
alone in nature:
Ex: Silver and Gold
5. What are molecules?
Molecules are the smallest particles
that can be divided without chemical
They are made of two or more atoms
joined together, can be the same
element or different elements.
A molecule of water is written H2O.
This means there are 2 atoms of
hydrogen and one atom of oxygen.