Periodic Table Trends
Objectives:
•I can predict chemical reactivity for an element based on its
number of valence electrons and location on periodic table.
•I can predict the charge for an element (ion) to reach
maximum stability.
•I can distinguish between metallic and non-metallic
properties.
•I can understand how the periodic table was organized by
Mendeleev and Moseley.
•I can graph and interpret periodic trends.
Chemistry 1/8/14
Objectives:
 Review Classroom Expectations
 Analyze first semester grades.
 Review Chemical Stability Concepts
 Chemistry Midterm make-ups addressed ASAP
Homework:
 Classroom Expectation Hand-out signed/returned.
 Complete Chemical Stability Worksheet
ICP: /8/13
Objectives:
 Review Classroom Expectations
 Analyze first semester grades.
 Motion on Graph Worksheet
 Chemistry Midterm make-ups addressed ASAP
Homework:
 Student/Parent sign Classroom Expecation
Hand-out
 Complete Motion on Graph Worksheet
Chemistry 1/10/14
Objectives:
 Analyze first semester grades.
 Review Periodic Trends Graphs
 Review Chemical Stability Concepts
Homework:
 Classroom Expectation Hand-out signed/returned.
 Complete Chemical Stability Worksheet
Analyze First Semester Grades
Address reasons for scores.
 Address your graphs


Periodic Properties and Trends
Atomic Radius:
-Size of an atom.
-The distance from the nucleus to the outermost energy level in
picometers, pm. (1pm = 1x10-12 m)

Ionization Energy:
-The amount of energy needed to remove a valence electron from an
atom.
-The amount of energy needed to overcome the attractive force the
ve- has with protons in the nucleus.
-Energy required for an atom to become a cation, more stable.

Electronegativity:
-The degree of attraction one atom’s protons has toward another
atom’s ve-.
-Determines the type of bond between the atoms, ionic or covalent.
Chemistry 1/13/14
Due:
 Chemical Stability Cross Word Puzzle
 Classroom Expectation Hand-Out signed.
Objectives:
 Review Chemical Stability Concepts
 Review Periodic Trends Graphs
Homework:
 Periodic Table Worksheet
Chemical Stability Worksheet
Periodic Trends: Atomic Radius
Across a Period
•Decreases
Atomic Number vs. Atomic
Radius
200
atomic raidus (pm)
180
160
140
Down a Group
•Increases
120
100
80
60
40
20
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15 16 17 18
atomic number
Periodic Table : Atomic Radius
Periodic Trends: Ionization Energy
Atomic Number vs. Ionization Energy
2500
Ionization Energy (kJ/mol)
Across a Period:
•Increases
2000
1500
1000
Down a Group:
•Decreases
500
0
1
3
5
7
9
11
Atomic Number
13
15
17
Periodic Trend: Electronegativity
Across a Period:
•Increases except
noble gases.
Down a Group:
•Decreases
except for noble
gases.
mmsphyschem.com
Electronegativity and Chemical Bonding
•Do metals or non-metals have a greater electronegativity
value?
Periodic Trends Analysis

To determine why your term(atomic
radius, ionization energy, or
electronegativity) exhibits this trend
across a period and down a group.

Think about the definition of your term
and how it is affected across a period and
down a group.
Periodic Trend Values
1. Use your atomic radius graph to rank the
following elements in increasing atomic radius.
Cl, Mg, Al, Na
2. Use your ionization energy graph to rank the
following elements in decreasing ionization
energy. Ba, Mg, Ca, Be
Chemical Stability
Octet Rule:
 Atoms will gain, lose, or share valence electrons
to reach maximum stability.
What is maximum stability for most atoms?
 8 valence electrons (ve-)
 Exceptions: H and He max. stability = 2 ve-
How do atoms achieve stability ?
 Atoms chemically bonding with other atoms.
 Formation of diverse compounds in nature.
Chemical Stability: Octet Rule
Metals will lose ve- to reach stability.
 Form a cation (+ charged)

www.teacherfurse.com
Non-metals will gain ve- to reach stability.
 Form an anion (- charged)

http://www.green-planet-solar-energy.com/the-element-chlorine.html
Chemical Stability-Key
Determine what type of charge each element below
would form to reach maximum stability.
a.
b.
c.
d.
e.
Sodium Na1+
Oxygen O2Argon
Ar
Phosphorus p3Chromium Cr2+
Size of an Ion
Use the diagram below to determine what happens
to the size of a neutral atom(parent atom) when it
becomes an ion.
Size of a Cation
Why is the cation smaller than its parent atom (neutral)?
Size of a Cation
A cation is smaller than its parent atom.
Why? Because metals will lose an energy level in the process
of becoming a cation.
Size of an Anion
Why is an anion larger than its parent atom?
Size of an Anion
A anion is larger than its parent isotope.
Why? Repulsion force increases as more electrons are
added to the outer most energy level. Swells the energy leve
Size of Ions
a.
Circle the atom that is larger in size.
Ca or Ca2+
b.
S or S2-
1.
Circle the atom that is smaller in size.
a. Al or Al3+
2.
b. N or N 3-