,br> "Developmental models to explain common chemical reactions and changes in states of matter."

• All matter is made up of atoms. Atoms are far too small to be seen with a light microscope.
  
• Atoms and molecules are in motion. The greater the temperature, the greater the motion.
  
• Atoms may join together in well-defined molecules or may be arranged in regular geometric patterns.
  
• Interactions among atoms and/or molecules result in chemical reactions.
  
• The atoms of any one element are differnt from the atoms of other elements.
  
• There are more than 100 elements. Elements combine in a multitude of ways to prduce compounds that account for all living and nonliving sustances. Few elements are found in their pure form.
  
• The periodic table is one useful model for classifying elements. THe periodic table can be used to predict properites of elements (metals, nonmetals, noble gases).
  

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