7th Grade Ch  1 Sec  2 Atoms Bonding and The Periodic Table
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7th Grade Ch 1 Sec 2 Atoms Bonding and The Periodic Table

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7th Grade Ch  1 Sec  2 Atoms Bonding and The Periodic Table 7th Grade Ch 1 Sec 2 Atoms Bonding and The Periodic Table Presentation Transcript

  • CH. 1 SEC. 2 ATOMS, BONDING & THE PERIODIC TABLE
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  • Silicon has 14 electrons. The 4 electrons that orbit the nucleus in the outermost "valence" energy level are given to, accepted from, or shared with other atoms. Silicon
  • valence electrons =
        • electrons farthest from nucleus
        • involved in bonding
  • Electron dot diagrams way of showing # valence electrons
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    • Much like people, most atoms don't like to live solitary existences.
    • They need to COME TOGETHER with other atoms to lead more stable, happier lives. 
    • This process of coming together is called chemical bonding.
  • chemical bond
    • force that holds atoms together
    • electrons may be transferred from one atom to another, or they may be shared between atoms
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  • Patterns of Valence Electrons After the number of valence electrons reaches 8, a new period begins.
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    • # of protons in nucleus
      • elements arranged in order of increasing atomic #
    atomic number
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    • group (family) = column (up & down)
    • period = row
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  • Alkali metals
    • Group 1
    • 1 valence electrons
    • react with other atoms by losing valence electron
  • Noble gases
    • Group 18
    • 8 valence electrons
    • (except helium has 2)
    • don’t react very easily with other atoms
  • NOBLE GASES
  • NOBLE GASES
  • Halogen family
    • Group 17
    • 7 valence electrons
    • React with other atoms by gaining 1 electron