8th Grade-Ch. 1 Sec. 2 Atoms Bonding & The Periodic table

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8th Grade-Ch. 1 Sec. 2 Atoms Bonding & The Periodic table

  1. 1. CH. 1 SEC. 2 ATOMS, BONDING & THE PERIODIC TABLE
  2. 4. 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 Si
  3. 7. valence electrons = <ul><ul><ul><li>electrons farthest from nucleus </li></ul></ul></ul><ul><ul><ul><li>involved in bonding </li></ul></ul></ul>
  4. 9. electron dot diagram (Lewis dot structure) <ul><li>way of showing # valence electrons </li></ul>
  5. 11. Patterns of Valence Electrons After the number of valence electrons reaches 8, a new period begins.
  6. 12. <ul><li>Much like people, most atoms don't like to live solitary existences. </li></ul><ul><li>They need to COME TOGETHER with other atoms to lead more stable, happier lives.  </li></ul><ul><li>This process of coming together is called chemical bonding. </li></ul>
  7. 13. chemical bond <ul><li>force that holds atoms together </li></ul><ul><li>electrons may be transferred from one atom to another, or they may be shared between atoms </li></ul>
  8. 16. <ul><li># of protons in nucleus </li></ul><ul><ul><li>elements arranged in order of increasing atomic # </li></ul></ul>atomic number
  9. 18. <ul><li>group (family) = column (up & down) </li></ul><ul><li>period = row </li></ul>
  10. 20. alkali metals <ul><li>Group 1 </li></ul><ul><li>1 valence electron </li></ul><ul><li>react w/ other atoms by losing valence electron </li></ul>
  11. 21. halogen family <ul><li>Group 17 </li></ul><ul><li>7 valence electrons </li></ul><ul><li>react w/ other atoms by gaining 1 electron </li></ul>
  12. 22. noble gases <ul><li>Group 18 </li></ul><ul><li>8 valence electrons </li></ul><ul><li>(except helium has 2) </li></ul><ul><li>don’t react very easily with other atoms </li></ul>
  13. 23. NOBLE GASES YouTube video-Periodic Table

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