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Do Now. What is represented by the dots in a Lewis electron-dot diagram of an atom of an element in Period 2 of the Periodic Table ? the number of neutrons in the atom the number of protons in the atom the number of valence electrons in the atom

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Do Now

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  1. Do Now • What is represented by the dots in a Lewis electron-dot diagram of an atom of an element in Period 2 of the Periodic Table? • the number of neutrons in the atom • the number of protons in the atom • the number of valence electrons in the atom • the total number of electrons in the atom

  2. Periodicity, Part 5 Williamsburg High school for architecture and design Mr. Quinn and Ms. Tom 11/1/13

  3. Aim • What is the difference between metals, metalloids, and nonmetals?

  4. What are metals, anyway? • Something with metallic properties • Most elements

  5. What are some properties of metals?

  6. A Proper Definition • “A metal is a collection of atoms held together in a sea of loosely-held electrons.”

  7. And the Rest… • Non-metals are elements lacking metallic properties • Metalloids are somewhere in between • Look at your handout!

  8. Building the Periodic Table

  9. Regents Practice #1 • An element that has a low first ionization energy and good conductivity of heat and electricity is classified as a • metal • Metalloid • Nonmetal • noble gas

  10. Regents Practice #2 • What are two properties of most nonmetals? • high ionization energy and poor electrical conductivity • high ionization energy and good electrical conductivity • low ionization energy and poor electrical conductivity • low ionization energy and good electrical conductivity

  11. Regents Practice #3 • Which Group 14 element is a metalloid? • Tin • Silicon • Lead • carbon

  12. Regents Practice #4 • A solid element that is malleable, a good conductor of electricity, and reacts with oxygen is classified as a • Metal • Metalloid • noble gas • nonmetal

  13. Regents Practice #5 • At STP, which element is solid, brittle, and a poor conductor of electricity? • Al • K • Ne • S

  14. Regents Practice #6 • Which element has both metallic and nonmetallic properties? • Rb • Rn • Si • Sr

  15. Regents Practice #7 • Which elements are malleable and good conductors of electricity? • iodine and silver • iodine and xenon • tin and silver • tin and xenon

  16. Regents Practice #8 • Which element has chemical properties that are most similar to the chemical properties of fluorine? • Boron • Chlorine • Neon • oxygen

  17. Everybody Writes • A scientist finds an element that exists as a soft solid that she can flatten between her fingers. It conducts electricity well and reacts with Group 17 elements by giving up electrons. She classifies it as a Group 14 element. Is she correct? Defend your answer.

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