The Building Blocks of All Substances Elements The Building Blocks of All Substances

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

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

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

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

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.

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

Elements Correct or Incorrect ca CA cA CA Ca Ca CA

Elements Correct Ca CA cA CA Ca Ca CA