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http://www.pinterest.com/pin/307300374548484516/. TURN IN. GOAL SHEETS ATOMIC HISTORY. UPDATE YOUR TOC. 10/23/14 Charges and Electrons pg # LT: How can the number of electrons effect an element and how does it relate to the periodic table?.

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  1. http://www.pinterest.com/pin/307300374548484516/

  2. TURN IN GOAL SHEETS ATOMIC HISTORY

  3. UPDATE YOUR TOC 10/23/14 Charges and Electrons pg# LT: How can the number of electrons effect an element and how does it relate to the periodic table?

  4. Electroscope and Vandegraff Demo Document any observations you see during the demonstration Answer the following Questions: How did the pins of the electroscope react when a charged object was introduced? How did the objects react when they were introduced to the Vandegraff machine?

  5. MAIN IDEAS • The main idea of the demo. was to demo diffr. chrgs. • There r 2 types of chrgs. positive (+) & negative (-). • Opp. chrgsattract: • (+) & (-) • (-) &(+) + - - + I love you! I love you too!

  6. MAIN IDEAS • Sme. Chrgs. repel • (+) and (+) • (-) and (-) + + - - Get away from me! Gladly!

  7. Questions and Review of the Read What is an ion? If they are composed of charged particles how can they be neutral? • Is when an entire molecule or atmis chrgd • P=e-

  8. What happens when I take an electron away?

  9. Questions How many protons and electrons does Na have? What about a Sodium ION? • Na= P 11, e- 11 (if neutral) • Na 1+ has 1 more + chrg than it does a - chrge. The extra + charge makes the whole atm. charged. • P = 11 (can the # of P change?) • Electrons = 10 Na 0 Na1+ + e- 11e- 11p+ 10e- 11p+ + e-

  10. Questions and Review of the Read How many protons and electrons does Cl have? What about a Chloride ION? • Cl= P 17 e- 17 (if neutral) • Cl -1 has 1 more - chrgthan it does a + chrg. The xta - chrgmakes the whole atmcharged. • P = 17 (can the # of protons change?) • e-= 18

  11. Questions How many protons and electrons does Ca have? What about a Calcium ION? • Ca= P 20 e-20(if neutral) • Ca 2+ has 2more + chrgsthan it does a - chrgs. The 2 xtra + chrgsmakes the whole atmcharged. • P = 20 (can the number of protons change?) • e-= 18

  12. Electronegativity • Electronegativity is the ability of an atom to attract electrons. • Fluorine (the most electronegative element) having a value of 4.

  13. Research Electronegativity Answer the following questions: What are the trends of electronegativity as you move across a period and down a group?

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