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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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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
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.
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
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
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
Tuesday!
• P of F p.4: Valence Electrons / Lewis Dot Structures
• Lab! Periodic Families 
Periodic Law
• Repeating physical and chemical properties change periodically with their atomic #
• Modern term for Mendeleev’s “chemical periodicity”
• Why does this happen?
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
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
Lab: Periodic Table Families Lab
• Lets go to the lab!!
• What do we notice is going on??