1. The Atom
Science 9

2. Objectives By the end of the lesson you should be able to:
Identify and describe the three main parts of an atom
The relationship between atoms and elements
How to write chemical symbols
Briefly describe some common elements

3. The Atom Protons Neutrons Subatomic particles Electrons
Made up of three particles
Protons
Neutrons
Electrons
Subatomic particles
Protons have a positive charge
Electrons have a negative charge
Neutrons are neutral (no charge)
Atoms with equal protons and electrons are neutral

4. The Atom Nucleus is at the center of the atom
Contains neutrons and protons
Is always postive
Is very very very small ( nuclei lined up across diameter of atom)
Electrons make up 99.99%
of atom volume
Give numbers 1-4 and students researched assigned person
Groups all number 4 together to share what they learned
Make new groups with numbers 1-4 so they can share with eachother (jig saw)

5. Elements and Atoms Elements cannot be broken down
Each element is made of one type of atom
Atoms differ in the number of protons, neutrons and electrons
All protons are identical
Protons in carbon are the same as protons in gold
All atoms of an element have the same number of protons
ONLY protons determine the type of element
Give numbers 1-4 and students researched assigned person
Groups all number 4 together to share what they learned
Make new groups with numbers 1-4 so they can share with eachother (jig saw)

6. Elements 118 known elements 94 found in nature Rest created in labs
All the elements
we know about are
found on the
Periodic Table of
Elements
Give numbers 1-4 and students researched assigned person
Groups all number 4 together to share what they learned
Make new groups with numbers 1-4 so they can share with eachother (jig saw)

7. C H He Carbon Helium Elements Hydrogen
Each element has a unique chemical symbol
Symbols are short – one or two letters
First letter is capitalized
If there is a second letter it is lower case
Carbon C
Hydrogen H
Give numbers 1-4 and students researched assigned person
Groups all number 4 together to share what they learned
Make new groups with numbers 1-4 so they can share with eachother (jig saw)
Helium He
Matching Activity and Common Ion Questions