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Today in ScienceYou will Need:1)Pencil, Colored Pencils, Highlighters or Markers, Textbook open to P.T.2)Power Notes – Classification of Matter –Part 2 – 2 page 4 sides-Bookshelf- Staple to yesterday’s paper
Check Off
Date Given
Date Due
Name of Assignment Possible Pts.
Earned Pts.
3/15 3/15Test #2 Part 1 (on-line) 95
3/16 3/16 Test #2 Part 2 (written), Extra Credit, Notes 155/8/20
3/19 3/22Test Corrections & Signature
40
3/19 3/23 STAR CARDS #1-30 60
3/19 3/21Power Notes – Classifications of Matter & Periodic Table - Overview
Test Retakes starting Thur. Mar. 22nd until Thur. Mar. 29th
Topic: Bohr Model vs. Electron Cloud
Quantum Numbers
Example
Electron Configuration
Valence electrons
Valence and the Periodic Table
Example:
1. The columns or families each element is located in tells you the number of valence electrons for families 1, 2…..13,14,15,16,17 and 18
2. Elements in Family 1 have 1 valence electrons
3. Elements in Family 2 have 2 valence electrons
4. Elements in Family 13 have 3 valence electrons
2. The pattern continues up to Family 18
3. The pattern DOES NOT occur for the Transition elements (short columns)
Transition Elements
Remember:
Basic Configuration
Example:
Metals give away their electrons, while nonmetals take.
1.The Periodic Table Connections – 1st 3 rows only
-Rows = # of shells or levels around the nucleus-# of elements in each row = # of electrons found on that level
Row 1 =
1 shell around nucleus; maximum of 2 electrons on shell
Row 2 =
2 shells around nucleus; maximum of 8 electrons on shell
Row 3 =
3 shells around nucleus; maximum of 8 electrons on shell
Lewis Dot Diagrams
Example:Beryllium is in Family #2
1. Shows only valence electrons2. Illustrated using ELEMENT
SYMBOL and DOTS to represent only the valence electrons.
3. Beryllium is in Family 24. Therefore Beryllium has a
VALENCE of 2
Be
Drawing the Bohr Models and Lewis Dot Diagrams
1. Locate the element on the P.T.2. Record the info about the
element.3. Draw the nucleus and write
the # of each type of subatomic particle inside.
4. Draw the correct amount of shells outside the nucleus based on the row #
5. Start loading electrons on the specific shells from the inside out.
6. Remember: YOU MUST load each shell full before moving farther out to the next shell.
Let’s try a couple:
LithiumRow=Protons =Neutrons =Electrons =
Lewis Dot
2
3+
7-3=4
3-
P = 3+N = 4
2-1-
Li
Let’s try a couple:
OxygenRow=Protons =Neutrons =Electrons =
Lewis Dot
2
8+
16-8=88-
P = 8+N = 8
2-6-
O
Comparing Bohr Model w/ Modern Atomic Theory
Textbook pg. 169http://dwb4.unl.edu/chemAnime/BOHRQD/BOHRQD.html
•List 3 unique qualities of Bohr’s atomic model.•List 3 unique qualities of the Modern Atomic Theory (Electrons Cloud)•List 3 similarities between these two models.
Electron Cloud
Bohr Model
Both
Review1. Answer review questions #1-15 using
your notes to help you.2. Review and Reflect on ALL PAGES3. Due Tomorrow
Homework1) Complete All Pages by Tomorrow
Due Tomorrow2) STAR CARDS #1-30 –
Due Friday at the beginning of class
