Elements Review

Investigation 4

Mixtures and Solutions

Earth Elements• What are the six most abundant elements in

living organisms? What percentage of an organism is made of these six elements?

• What are the six most abundant elements in the Earth? What percentage of Earth is made of these six elements?

• How can so many different substances in the world be made of so few elements?

• What does it mean when a person says everything is made of stardust?

New Technologies• How do scientists know that atoms and

molecules combine in well-ordered arrays?

• Explain why the periodic table has over 110 elements when only 90 occur naturally on Earth.

Summary: Elements• What is an atom?

• What is an element?

• Explain why there are so many different substances in the world.

• What properties do all metals have in common?

• What is the periodic table of the elements?