The document discusses the building blocks of all substances from trees down to the elemental level. It explains that trees have parts like leaves, branches, and roots. Leaves have parts like veins and chlorophyll, which is composed of elements like magnesium, nitrogen, carbon, hydrogen, and oxygen. Elements are pure substances that cannot be broken down further, and there are about 90 naturally occurring elements named on the periodic table, some after people or places and following a systematic naming convention using symbols with specific capitalization rules.

1. 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 Incorrect
CA
CACa
Ca
CA
cA

9. Elements
Correct
CA
CACa
Ca
CA
cA

10. Elements
Correct
CA
CACa
Ca
CA
cA