1. The Building Blocks of All Substances
Elements
The Building Blocks of All Substances

2. A Tree What are its parts?
leaves
branches
roots
trunk
stems
etc.

3. A Leaf What are its parts?
veins
covering
chlorophyll
(green pigment)
etc.

4. Chlorophyll What are its parts (elements)?
Magnesium
Nitrogen
Carbon
Hydrogen
Oxygen

5. Elements What are their parts?
Elements are pure substances that cannot be broken down into simpler substances.
For chlorophyll, the elements are:
C = carbon
H = hydrogen
O = oxygen
Mg = magnesium
N = nitrogen

6. Elements How are they named?
All the elements we know about at this time are listed on the current periodic table.
There are about 90 naturally occurring elements. Some are named after people, places, or from Latin or Greek names.
Since there are only 26 letters in our alphabet, a systematic way to write their symbols was developed by scientists.

7. Elements 3 Naming Rules Rule 1: PRINT all symbols.
Rule 2: If there is only one letter, that letter is always a capital.
Example: H for hydrogen
Rule 3: If there are two letters, the first letter is a capital and the second is lower case.
Example: He for helium

8. Elements Correct or Incorrectca CA cA CA Ca Ca CA

9. Elements Correct Ca CA cA CA Ca Ca CA