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Matter & The Atom

Matter & The Atom. Matter. The term matter describes all of the physical substances around us Matter is anything that has mass and takes up space The Universe is made up of matter and energy.

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Matter & The Atom

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  1. Matter &The Atom

  2. Matter The term matter describes all of the physical substances around us Matter is anything that has mass and takes up space The Universe is made up of matter and energy

  3. *Matter is made up of atoms.*An atom is the smallest whole particle of matter.* Sub-Atomic particles are smaller than atoms and are the tiny particles that an atom is made of.

  4. Early Models of the AtomRutherford • Mostly empty space • Small, positive nucleus • Contained protons • Negative electrons scattered around the outside

  5. Early Models of the AtomBohr • Electrons move in definite orbits around the nucleus

  6. Modern Model of the AtomThe electron cloud • Sometimes called the wave model • Spherical cloud of varying density • Varying density shows where an electron is more or less likely to be

  7. Atomic Structure • Nucleus • Protons • Neutrons • Electrons

  8. Atomic Structure • Electrons • Tiny, very light particles • Have a negative electrical charge (-) • Move around the outside of the nucleus

  9. Atomic Structure • Protons • Much larger and heavier than electrons • Protons have a positive charge (+) • Located in the nucleus of the atom

  10. Atomic Structure • Neutrons • Large and heavy like protons • Neutrons have no electrical charge • Located in the nucleus of the atom

  11. Atomic Structure

  12. Describing Atoms • Atomic Number = number of protons • In a neutral atom, the # of protons = the # of electrons • Atomic Mass= the number of protons + the number of neutrons

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