Transcript Chemical Periodicity

Periodic Trends
Mr. Chan
Northwestern University
Day 77
 Discuss
Tests (0-10)
 Warmup (10-15) –
configurations for O and Si
 Organization of Periodic Table
(15-25)
 Coloring Periodic Table (2540)
 Review/Summary (40-43)
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
How Periodic Table is Periodic
 Periods,
groups
 How are electron
configurations related in the
periodic table?
 Noble gases
All configurations end in s2
Day 78 (B-Day)
 Warmup
(0-5)
 What configurations do the
following groups have?
Alkali metals, Halogens
 Finish Coloring Periodic Table (5-20)
 Periodic Trends (20-35)
Periodic Trends
 Certain
patterns exist in periodic
table
 Atomic Size (Atomic Radius)
 Half the distance between nuclei of
two like atoms in diatomic
molecule
 Trend:
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+
 Finish Periodic Trends (15-35)
 Finish Coloring Periodic Table
Ionization Energy
 Energy
required to overcome the
attraction of the nuclear charge
and remove an electron from a
gaseous atom
 Trend
 Down group (decreases)
Size of atoms increases,
outermost electron farther
Electronegativity
 Tendency
for atoms of element to
attract electrons when they are
chemically combined
 Trend
 Down group (decreases)
 Across group (increases)
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)
Summary of Periodic Trends