Periodic Trends

1
Periodic Trends

• To insert your company logo on this slide
• From the Insert Menu
• Select Picture
• Locate your logo file
• Click OK
• To resize the logo
• Click anywhere inside the logo. The boxes that
  appear outside the logo are known as resize
  handles.
• Use these to resize the object.
• If you hold down the shift key before using the
  resize handles, you will maintain the proportions
  of the object you wish to resize.

• Mr. Chan
• Northwestern University

2
Day 34 (B-day)

• Discuss Tests (0-10)
• Warmup (10-15) configurations for O and Si
• Organization of Periodic Table (15-25)
• Introduction of Research project (25-35)
• Coloring Periodic Table (25-35)
• Review/Summary

3
Development of Periodic Table

• Show Mendeleev original periodic table
• Periodic Law
• Periodic pattern in their physical and chemical
  properties
• Originally ordered in increasing atomic mass, now
  increasing atomic number

4
How Periodic Table is Periodic

• Periods, groups
• How are electron configurations related in the
  periodic table?
• Noble gases
• All configurations end in s2 or p6
• Outermost s and p sublevels filled
• Representative elements
• All end in s or p
• Only partially filled
• Alkaline metals
• Alkaline earth metals
• Halogens
• Transition metals
• All end d or f (inner transition)
• Groups of elements end in same configurations

5
Day 35 Substitute

• 0-43 Mendeleev Solitaire
• 0-43 Rough Science Video

6
Day 36 Comp.Lab

• 0-43 Elements Necessary for Life

7
Day 37 Comp. Lab

• 0-43 Elements Necessary for Life

8
Day 38 Substitute

• 0-43 Periodic Trends Graphing
• 0-43 Rough Science 2

9
Day 39

• Halloween demos

10
Day 40

• Warmup (0-5)
• What configurations do the following groups have?
  
• Alkali metals, Halogens
• Periodic Trends (5-25)
• Review activity on Friday graphing trends
• Activity Think Pair Share (25-35)
• Prelab (35-43)
• Lab (0-43)

11
Warmup

• What is the ending electron configuration for the
  following groups?
• Alkali metals
• Halogens

12
Periodic Trends

• Recall meaning of terms periodic, trends
• Show Powerpoint J.Weiner
• Certain patterns exist in periodic table

13
Atomic Size (Atomic Radius)

• Half the distance between nuclei of two like
  atoms in diatomic molecule (Ex. Cl -- Cl)
• Trends
• Down group (increases)
• Outermost orbital larger as you move downward
• Shielding increases, but larger orbitals overcome
• Across period (decreases)
• More protons, electrons. Electrons pulled closer
  to nucleus

14
Ionic size

• Cations (loss of electrons)
• Always smaller, with increased attraction by the
  nucleus with less electrons
• Anions (gain electrons)
• Always larger, effective nuclear attraction is
  less with more electrons

15
Ionization Energy

• Energy required to overcome the attraction of the
  nuclear charge and remove an electron from a
  gaseous atom
• Trends
• Down group (decreases)
• Size of atoms increases, outermost electron
  farther from nucleus, easier to remove
• Across period (increases)
• Nuclear charge increasing, greater attraction of
  nucleus for electron
• Discuss nuclear charge, shielding effect

16
Electronegativity

• Tendency for atoms of element to attract
  electrons when they are chemically combined
• Trend
• Down group (decreases)
• Across period (increases)

17
Summary of Periodic Trends

• Think Pair Share Summarize/show trends on blank
  periodic table

18
Lab Seeing a Trend in Person

• Discover trend across a period and within a group
• Chemical Reactivity and Solubility
• Make connections to atomic size, ionization
  energy, electronegativity

19
Day 41

• Computer Lab Research

20
Day 42

• Presentations

21
Day 43

• Review

22
Day 44

• Quiz

23
Day 79

• Discuss HW (0-10)
• Warmup/Review (10-15)
• Bigger? Ca vs. Sr
• Bigger? P vs. S
• Bigger? O vs. O2-
• Bigger? K vs. K
• Demo Alkali metals?
• Finish Periodic Trends (15-35)
• Finish Coloring Periodic Table (35-43)
• Periodic Trends Activity (0-30)
• ACT Practice (30-43)

24
Day 80

• Discuss HW (0-10)
• Warmup/Review (10-15) (if time)
• Bigger IE? Ca vs. Sr
• Bigger EN? P vs. S
• Discussion of Project (15-20)
• Video (20-43)