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Matter and Atoms

Matter and Atoms. 4-1. What is Matter?. Matter – a term used to describe anything that has mass and takes up space Not matter Light Heat Energy. Early Ideas. Democritus Universe made of empty space and tiny bits of stuff Atom – Greek word meaning “can not divide”. Atom.

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Matter and Atoms

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  1. Matter and Atoms 4-1

  2. What is Matter? • Matter – a term used to describe anything that has mass and takes up space • Not matter • Light • Heat • Energy

  3. Early Ideas • Democritus • Universe made of empty space and tiny bits of stuff • Atom – Greek word meaning “can not divide”

  4. Atom • Atom – a small particle that makes up most types of matter

  5. Conservation of Matter • 2,000 years pass • Lavoiser – showed that no change in mass during chemical reactions • Example – log burning

  6. Proust • Proust – matter is made of small particles that behave in ways that can be predicted and measured

  7. Dalton’s Models of an Atom • John Dalton – 1st model of an atom • All of the atoms in something are identical • Atoms of different elements are different from each other

  8. Size of an Atom • 1980’s – electron microscopes • Allowed Scientist to see an atom

  9. Inside an Atom • Nucleus – center of an atom • Contains protons and neutrons • Proton – particle with a positive charge (+) • Neutron – particle with no charge (0) • Most of mass

  10. Inside an Atom • Electrons – particle inside an atom with a negative charge • Equal number of protons and electrons • Located in electron cloud

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