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Chapter 4: The Periodic Table. Pgs. Pgs. 114 – 155 in your book. Happy Monday! Welcome back!. YOU NEED YOUR BOOKS TODAY – GO GET THEM NOW !! Packet O Fun – p1, intro activity – work with the people around you. Read pgs. 116-118 in book Complete p2 in P of F Notes.

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  1. Chapter 4: The Periodic Table Pgs. Pgs. 114 – 155 in your book

  2. Happy Monday! Welcome back! • YOU NEED YOUR BOOKS TODAY – GO GET THEM NOW!! • Packet O Fun – p1, intro activity – work with the people around you. • Read pgs. 116-118 in book • Complete p2 in P of F • Notes

  3. History of the Periodic Table • In this chapter we are studying the periodic table. • As you read, the credit for the modern periodic table goes to Dmitri Mendeleev. • Mendeleev recognized that there were repeating patterns in the periodic table and he organized the table around this periodicity.

  4. John Newlands 1865: English Chemist • Arranged the known elements according to • Physical and chemical properties & • in order of increasing atomic mass • Law of Octaves/ Rule of Eight • All elements in a given row had similar properties and this pattern repeated every eight elements

  5. John Newlands—Law of Octaves

  6. Dmitri Mendeleev 1869: Russian Chemist • Invented the first Periodic Table • Organized the 63 known elements in vertical columns according to their properties • Two interesting things came from this: • Gaps • Elements did not necessarily fit according to atomic mass

  7. Dmitri Mendeleev

  8. Henry Moseley 1909: English Chemist • Looked at x-ray spectra • Spectral lines were correlated to atomic number • Led to the current organization of the PT according to • Increasing atomic number

  9. Henry Mosley

  10. Tuesday! • P of F p.4: Valence Electrons / Lewis Dot Structures • Lab! Periodic Families 

  11. Periodic Law • Repeating physical and chemical properties change periodically with their atomic # • Modern term for Mendeleev’s “chemical periodicity” • Why does this happen?

  12. Valence Electrons • Electrons that are found in the outermost shell of an atom and that determine the atom’s chemical properties • Participate in reactions with other atoms • The s and p electrons at the highest energy level

  13. Valence Electron Practice • Practice determining the number of valence electrons using p.4 in your Packet O Fun!! • CW/HW: p5&6 – Valence electrons & Lewis Dot Structures

  14. Lab: Periodic Table Families Lab • Lets go to the lab!! • What do we notice is going on??

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