Bohr Model - Day 2

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Bohr Model - Day 2

  1. 1. You Will Need: 1. Pencil, Text Book- Periodic Table, Colored Pencils 2. Get out Bohr Model vs. Wave Model & Lewis Dot 3. Textbook open to Periodic Table (196- 197) 3. Electrons & Chemical Bonding 2 pages- 4 sides (Pick-up from bookshelf- Please Staple to the back of yesterdays papers) YOU SHOULD NOW HAVE 4 pages 7 sides to your packet.
  2. 2. Please SCHEDULE: 1. To take Part 2 for the 1st time OR to 2. Retake Test #3 • Part 2 – 101/145 or lower 3. Parent Signature and Corrections – due Tomorrow.
  3. 3. 1. What is one similarity between the Bohr Model and Wave Model?2. Why do scientists use models to study the atom?3. Which scientist believed the atomic structure to be like Plum Pudding?4. What is an electron configuration?5. Where do you find the valence electrons?6. What is the valence of Silicon? How do you know?7. How many more bonds does Silicon need to be full?
  4. 4. 8. What are the names of the two main types of bonds?9. Which type of bond are made when oppositely charged atoms are attracted to each other?10.If I find an element on Row 2, how many shells will the atomic structure have?11.What is the valence of Helium?12. What does the Lewis Dot Diagram show??
  5. 5. Question AnswerHow do you determine the • Rows the element is on = # of shellselectron configuration of the around nucleusatom? (This works for only the 1st • To load electrons on each shell – count3 rows) the number of elements in each row….this is the maximum number of electrons that can fit on that shell • YOU MUST load the inner shell FULL before moving on to the next shell.If the element is found in:Row #1 = 1 shell Maximum # of electrons = 2Row #2 = 2 shells Maximum # of electrons = 8Row #3 = 3 shells Maximum # of electrons = 8YOU MUST ALWAYS fill the inner most shell FULL before moving on tothe next shell.
  6. 6. Row # = # of shells in diagram# of elements in each row =Max electrons on that shell
  7. 7. Question AnswerHow do you determine the • Rows the element is on = # of shellselectron configuration of the around nucleusatom? (This works for only the 1st • To load electrons on each shell – count3 rows) the number of elements in each row….this is the maximum number of electrons that can fit on that shell • YOU MUST load the inner shell FULL before moving on to the next shell.If the element is found in:Row #1 = 1 shell Maximum # of electrons = 2Row #2 = 2 shells Maximum # of electrons = 8Row #3 = 3 shells Maximum # of electrons = 8YOU MUST ALWAYS fill the inner most shell FULL before moving on tothe next shell.
  8. 8. Question AnswerWhat about elements on • These Bohr models include subshells,rows 4,5,6 and 7? s, p,d & f(Do not need to know this for 8thgrade) • http://www.chem4kids.com/files/element s/006_shells.html • http://education.jlab.org/qa/electron_con fig.htmlWhat is the Lewis Dot • Shows how an element will bondDiagram? • Use the element symbol + the numberhttp://www.youtube.com/watch? of valence electronsv=ulyopnxjAZ8&feature=relmfuExample: Beryllium = Family 2 = Valence of 2 Please correct your worksheet. Be
  9. 9. Let’s try a couple: Follow these directions to complete the nextpage1. Locate the element on the P.T.2. Record the information about the element in column 1 of the chart3. Draw the nucleus and write the # of each type of subatomic particle4. Draw the correct amount of shells outside the nucleus based on the row the element is found5. Start loading electrons on the specific shells from the inside out (closest to the nucleus)6. Load each level (shell) FULL before going to the next. (Remember: each shell has a “maximum FULL” amount.)
  10. 10. Element Bohr Model Lewis Dot (Symbol + Valence)Lithium Row = Before moving to the next slide…..try to Electrons=Atomic # Protons = do this on your own and then checkAtomic Mass your answer– Atomic # Neutrons =
  11. 11. Element Bohr Model Lewis Dot (Symbol + Valence)Lithium Row = 2 1 Electrons= 3-Atomic # 2 Protons = 3+ P=3 N=4 LiAtomic Mass– Atomic # Neutrons = 4 7-3=Neon Row = 10 8Atomic # 2 Electrons= 10- Ne P =10 Protons = 10+ N =10Atomic Mass– Atomic # Neutrons = 10 20-10
  12. 12. Oral Presenters: In charge of today’s lesson on the computerEverything on this planet is made of atoms from elements.Even though the number of letters on the Periodic Table is limited, joining the letters in different ways allows you to make a huge number of combinations.
  13. 13. Question AnswerWhat is chemical bonding? • The joining of two or more atoms to form a compoundDo the compounds have the same • NOcharacteristics as the elements that • Compounds have very differentmake them up? characteristicsWhat happens when elements bond? • They can share valence electronshttp://www.mhhe.com/physsci/che (COVALENT)mistry/animations/chang_7e_esp/bo • They can transfer valencem1s2_11.swf (View the animation on electrons (donate or accept electronsLearningPoint) becoming ions) (IONIC)Do all the electrons in the atom • NOmake a chemical bond? • Only the valence electrons are involved in most casesWhen will atoms bond? • When their outermost shell is not complete
  14. 14. Element Group Valence Bond or Not BondHydrogen 1 1 BondMagnesiumOxygenSulfurKryptonLithiumCarbon
  15. 15. Question AnswerWhat are the characteristics • Usually between Metals and Nonmetalsof Ionic Bonds? • Transfer of electrons – atoms become IONS • Form Crystal Lattices • Brittle • High melting and boiling points • Dissolve easigly in water • Form compounds • Specific shape
  16. 16. Crystal Lattice uthBi s m
  17. 17. Question AnswerWhat are the characteristics • Usually between Metals and Nonmetalsof Ionic Bonds? • Transfer of electrons – atoms become IONS • Form Crystal Lattices • Brittle • High melting and boiling points • Dissolve easily in water • Form compounds • Specific shapeIllustrate a neutrally charged Bohr Before you move to the next slide….tryModel of an aluminum atom. to draw this on your own and then check to see how you did. If you made a mistake….figure out what you did incorrectly.
  18. 18. Question AnswerWhat are the characteristics • Usually between Metals and Nonmetalsof Ionic Bonds? • Transfer of electrons – atoms become IONS • Form Crystal Lattices • Brittle • High melting and boiling points • Dissolve easily in water • Form compounds • Specific shapeIllustrate a neutrally charged BohrModel of an aluminum atom. 3 2 8 P=13 N=14
  19. 19. Question AnswerIllustrate a positively charged Bohr Before you move onto the nextModel of an aluminum atom. (3+) slide….try to draw this on your own.
  20. 20. Question AnswerIllustrate a positively charged BohrModel of an aluminum atom. (3+) 8 2 P=13 N=14Why is Al3+ considered an ion? (Look at all the subatomic particles before you answer this question.)
  21. 21. Forming Sodium Chloride http://www.youtube.com/watch?v=upg-FUHp6ys http://www.youtube.com/watch?v=7DjsD7Hcd9UBefore (pg. 233) AfterQuestions: Questions:1)Why does Sodium become an 1)Why do Sodium and ChlorineIon? bond?2)Is it Positive or Negative? Why? 2)What is the overall charge of the3)Why does Chlorine become an compound?Ion? 3)Does NaCl have the same4)Is it Positive or Negative? Why? characteristics as Na and Cl? 4)What are some unique characteristics of NaCl?
  22. 22. Question AnswerWhat is a covalent bond? • Valance electrons are shared • More often between nonmetal • Low melting and boiling point • Free flowing but can be brittle • Form molecules • Do not have a specific shape - flexible
  23. 23. C 12 H 22 O 11C 6 H 10 O 5
  24. 24. http://www.youtube.com/watch?v=ulyopnxjAZ8&feature=relmfuDrawing Lewis Dot Diagram BondsMolecule Explanation Electron Dot (Color CodeIllustration each element) 1. What kind of bond does Hydrogen & Oxygen make? How P=8 do you know? N=8 2. Why does one P=1 Oxygen bond with P=1 N=0 N=0 two Hydrogen atoms?
  25. 25. 1. Schedule Test #3 retake2. Signed & Corrected Test #3- Due Tomorrow3. Bohr Model vs. Wave Model & Lewis Dot + Electrons and Chemical Bonding– Pgs. 1-7 – due Thursday

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