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Day 2 The Periodic Table

Day 2 The Periodic Table. Sci 10 Chemistry. Try creating your own Periodic Table. Look at the cards of the first 18 elements. Can you group them in a way that makes sense?.

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Day 2 The Periodic Table

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  1. Day 2 The Periodic Table Sci 10 Chemistry

  2. Try creating your own Periodic Table • Look at the cards of the first 18 elements. Can you group them in a way that makes sense?

  3. Mendeleïev created the modern periodic table of the elements, placing the elements in order of increasingatomic mass.

  4. Periods

  5. Groups

  6. Look back at your Periodic Table • Look at all of the models of elements in a Period (→) • What do they all have in common? • Look at all of the models of elements in a Group (↓) • What do they all have in common?

  7. Columns (vertical) of the periodic table are calledGROUPS • Elements in a group sharecharacteristics and propertiesbecauseall have same # of electrons on outershell • Rows (horizontal) of the periodic table are calledPERIODS • Elements in a period all have the sameamount of electronshell(s)

  8. Métalloides

  9. Metals and non-metals have differentproperties. • Metalloids have properties of metals and non-metals.

  10. Alkali Metals – Group 1

  11. Alkaline Earth Metals – Group 2

  12. Transition Metals (metals with more than one charge)

  13. Halogens – Group 17

  14. Noble Gases – Group 18

  15. Hydrogen – an exception • It can behave like an alkaline metal or like a halogen

  16. Back to electrons… • Electrons are located on shells around the nucleus • Different shells contain different number of electrons • Different elements have different numbers of shells • Valence shells: shell the farthest away from nucleus • Valence electrons : electrons on the valence shell

  17. Period # indicates the # of electron shells: • Period 1 – 1 shell (2 e- max) • Period 2 – 2 shells : • shell #1 - 2 e- max • Valence shell (shell #2) – 8 e- max • Period 3 – 3 shells : • shell #1 - 2 e- max • shell #2 – 8 e- max • Valence shell (shell #3) – 8 e- max

  18. Bohr-Rutherford Diagram/ Electron shell diagram An atomic model that shows the distribution of ALL electrons • Indicate the # of p+ and # of neutrons in nucleus (drawn as a circle) • Determine # of shells (# of period) • Add electrons (max 2 for the 1st, 8 for the 2nd and 8 for the 3rd)

  19. Group # represents the # of valence electrons • (number of electrons in outer shell) • If group # greater than 10, subtract 10 to find the # of valence electrons

  20. Lewis Structures/ Electron Dot Diagrams • A method of representing an atom that shows only its valence electrons sodium carbon chlorine

  21. Practice! • p.97 #15, 18, 19 • Day 2 - Questions

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