7th Grade Ch  3 Sec  1 Introduction To Atoms
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7th Grade Ch 3 Sec 1 Introduction To Atoms

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7th Grade Ch  3 Sec  1 Introduction To Atoms 7th Grade Ch 3 Sec 1 Introduction To Atoms Presentation Transcript

  • Ch. 3 Sec. 1 Introduction to Atoms
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  • central core of atom no charge positive charge negative charge
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  • Helium Electrons move within a sphere shaped region around the nucleus.
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  • (almost 2,000)
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    • # of protons in atom’s nucleus
    • used to identify element
    • Atomic mass number
    • sum of protons & neutrons
  • isotope- element with same # of protons & different # of neutrons
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  • Chadwick model Picture Brief description Model Present Modern model Bohr model Rutherford model Nagaoka model Thomson model Atoms all alike Diff. elements-diff. masses Dalton model
  • Were you paying attention?
  • Protons, neutrons and electrons
    • What are the three main particles in an atom?
  • proton- positive charge neutron- no charge electron- negative charge
    • How do the particles of an atom differ in electric charge?
  • Each atom has equal numbers of positively charged protons and negatively charged electrons.
    • Why do atoms have no electric charge even though most of their particles have charges?
  • The number of protons in each atom of that element.
    • What is the atomic number of an element?
  • Each element has a unique atomic number because all atoms of that element have the same number of protons.
    • How can atomic numbers be used to distinguish one element from another?
  • Each atom of nitrogen-15 contains 7 protons, 8 neutrons and 7 electrons.
    • The atomic number of the isotope nitrogen-15 is 7. How many protons, neutrons and electrons make up an atom of nitrogen-15?
  • Each atom of nitrogen-15 contains 7 protons, 8 neutrons and 7 electrons.
    • The atomic number of the isotope nitrogen-15 is 7. How many protons, neutrons and electrons make up an atom of nitrogen-15?
  • Atoms are too small to be seen.
    • What is the main reason that scientists use models to study atoms?