September 25, 2013
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Transcript of September 25, 2013
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September 25, 2013-When the bell rings voices are at zero, working on the DO NOW ( All electronics away!!) -Pick up daily handouts (There is an extra at the front of the room on a stool – get that one too!)-Pick up turned back docs-Turn in any LATE reports (M&M, Beanium, Nuclear Energy, Chemistry in a Bag) Vocab Corrections-DO NOT TURN ANYTHING IN UNLESS STATED ABOVE-HAVE OUT YOUR REFERENCE TABLE -Start on the Do Now in your Do Now formDO NOW 9/25/13Work on the Magic Squares handout you picked up, in your form write “magic squares handout”
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Do Now Review
DO NOW 9/25/13Magic Squares handout
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Homework
WANTED! Periodic Table Project Due 9/30
Vision Learning Chemical Bonding Module **Quiz must be complete by the time you come to class FRIDAY 9/27**
Graded***
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Upcoming Dates
• 9/25/2013 Empirical Formula QUIZ• 9/27/2013 Bohr Model Quiz • 9/27/2013 Lab Class (Dress appropriately,
bring composition notebook, safety contract)• 9/30/2013 Electron / Periodic Properties Test• 9/30/2013 Periodic Table Wanted Poster Due
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Tutoring • Tuesday 2:30-3:30 in room 529
• NO TUTORING THURSDAY – Test retakes and make ups ONLY
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Remind 101
• 1st and 4th text @murfchemhn to (336)554-7294• 3rd text @murfchem to (336)554-7294
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Valence Electron
s:ELECTRONS AVAILABLE
FOR BONDING
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Definition
Valence electrons are electrons in the outmost shell (energy level). They are the electrons available for bonding.
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Group 1 (alkali metals) have 1 valence electron
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Group 2 (alkaline earth metals) have 2 valence electrons
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Group 13 elements have 3 valence electrons
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Group 14 elements have 4 valence electrons
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Group 15 elements have 5 valence electrons
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Group 16 elements have 6 valence electrons
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Group 17 (halogens) have 7 valence electrons
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Group 18 (Noble gases) have 8 valence electrons, except helium, which has only 2
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Transition metals (“d” block) have 1 or 2 valence electrons
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Lanthanides and actinides (“f” block) have 1 or 2 valence electrons
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Dot NotationsAn atom’s valence electrons can be represented by Lewis dot notations.
1 valence e-
X2 valence e-
X3 valence e-
X4 valence e-
X5 valence e-
X6 valence e-
X7 valence e-
X8 valence e-
X
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Dot Notations – Period 2
Lewis dot notations for the valence electrons of the elements of Period 2.
lithium
Liberyllium
Beboron
Bcarbon
C
nitrogen
Noxygen
Ofluorine
Fneon
Ne
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Lewis Dot Practice
• Lewis Dot handout
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Poll Anywhere
• Of the following elements which would have the largest radius?
A. Lithium (Li) atomic #3B. Nitrogen (N) atomic #7 C. Neon (Ne) atomic #10 D. Boron (B) atomic #5
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Poll Anywhere
• As one moves from down ( ↓ ) a group on the periodic table, the electronegativity of the elements encountered tends to:
A. stay the same B. increase C. decrease
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Poll Anywhere
• The elements with the smallest atomic radii are found in the:
A. upper right-hand corner of the periodic table B. upper left-hand corner of the periodic table C. lower left-hand corner of the periodic table D. lower right-hand corner of the periodic table
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Poll Anywhere
• Cations have a ______________ charge and are ______________ than the atoms from which they formed.
A. negative/smaller B. positive/larger C. positive/smaller D. negative/larger
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Poll Anywhere
• A vertical column of elements on the periodic table can also be referred to as
A. Family B. Group C. period D. series
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Poll Anywhere
• Generally speaking the group of elements with the highest first ionization energy is
A. Group 17 B. Group 1 C. Group 16 D. Group 18
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Poll Anywhere
• Elements with the smallest atomic radii are found in the :
A. Lower left-hand corner of the Periodic table B. Lower right-hand corner of the PT C. Upper left-hand corner of the PT D. Upper right-hand corner of the PT
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Poll Anywhere
The energy required to remove an electron from an atom is known as
A. Radioactivity B. Electron Affinity C. Ionization energy D. Electronegativity
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Hands up Pair Up!
• Periodic Trends handout
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I have, Who has?
• Review!