Science review
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  • Describe using apple analogy
  • http://www.antonine-education.co.uk/Physics%20A%20level/Unit_1/Radioactivity/Structure/topic_1.htm
  • http://en.wikipedia.org/wiki/Periodic_table_%28large_version%29
  • http://education.jlab.org/glossary/isotope.html
  • Describe using apple analogy
  • http://web.jjay.cuny.edu/~acarpi/NSC/5-bonds.htm
  • http://en.wikipedia.org/wiki/Periodic_table_%28large_version%29
  • http://en.wikipedia.org/wiki/Periodic_table_%28large_version%29

Science review Science review Presentation Transcript

  • Science Review for Alana
  • What’s an atom?
    Smallest unit of matter
  • Structure of an atom
    Electron Cloud
    Nucleus
  • Subatomic Particles
    In the Nucleus:
    In the Electron Cloud:
    Protons: + charge
    Neutrons: no charge
    Mass of each:1 atomic mass unit (amu)
    Electrons: - charge
    Practically no mass
  • Neutral atom
  • Check
    What are the two overall structures in the atom?
    What are the names of the atomic particles?
  • What’s an element?
    Atoms with different numbers of protons
  • Atomic Number
    # of protons=atomic number
    Identification (student id# or SSN)
  • Why is it called “periodic”?
  • Check
    Where are the protons located?
    Where are the electrons located?
    Where are the neutrons located?
  • Neutral atom
  • Mass Number
    Protons + Neutrons
  • Exercise
    Draw a neutral lithium atom (protons, neutrons, electrons) with an mass number of 7
  • Isotope
    Atom with same # of protons but different # of neutrons (different mass number)
  • Radioactivity
    Too many or too few neutrons compared to protons
    UNSTABLE
    It wants to be sane (more stable)…so it gets rid of something!
    Emits a particle or energy
    Ever heard of uranium?
    Types of nucleus radiation that can be emitted:
    Alpha
    Beta
    Gamma
  • Check
    What is the atomic number?
  • Atomic mass
    Weighted atomic mass of the isotope of an element
  • Structure of an atom
    Electron Cloud
    Nucleus
  • Electron cloud
    Electrons arranged in Energy level
    1st level can hold 2 electrons
    2nd energy level can hold 8
    3rd…18
    4th…32
    Outermost electrons called valence electrons – chemical bonds
  • Electron cloud
  • Exercise
    Draw a neutral carbon atom with an atomic mass of 12
    Draw the electron cloud of Na
    Draw the electron cloud of Cl
  • Bonding
    As it turns out, atoms bond together for a very simple reason: atoms like to have full valence shells
    http://web.jjay.cuny.edu/~acarpi/NSC/5-bonds.htm
    http://www.kentchemistry.com/links/bonding/bondingflashes/bond_types.swf
  • Ions
    Atoms that are Not neutral
    # Electrons not equal to # protons
    Previous example of sodium and chlorine
  • Part K on review sheet
  • States/Changes of matter
    Solids, liquids, gases
    http://www.chem.purdue.edu/gchelp/liquids/character.html
    http://www.clickandlearn.org/Gr9_Sci/Particle_Theory.htm
  • Solutions
    http://www.chem4kids.com/files/matter_solution.html