Transcript Recreating the Periodic Table

Intro to the Periodic Table
Periodic Trends Graphing Activity
• Objective
– Today I will be able to:
• Explain why different families on the periodic table
have similar properties
• Evaluation/ Assessment
– Informal assessment – Listening to group
interactions and discussions as they color and
complete the practice sheet
– Formal Assessment – Analyzing student responses
to the exit ticket and practice worksheet
Lesson Sequence
• Engage: Warm – Up
• Engage: Coloring the Periodic Table
• Explain: Introduction to the periodic table
notes
• Elaborate: Periodic Table WS
– Evaluate: Exit ticket
Warm - Up
• What is the most stable family on the periodic
table?
• Why is this family the most stable?
• What families contain the most reactive
elements on the periodic table?
Objective
• Today I will be able to:
– Explain why different families on the periodic
table have similar properties
Homework
• Complete the backside of the Coloring the
Periodic Table packet
• Turn in the Reading the Periodic Table
worksheet
Agenda
•
•
•
•
•
•
Warm – Up
Alkali Metals Video
Introduction to the Periodic Table Notes
Recreating the Periodic Table
History of the Table
Exit ticket
Reactivity of Metals
• Watch the video clip that Mr. Klotz plays and
think about these questions:
– What families contain the most reactive elements
on the periodic table?
– Why are they the most reactive elements?
Intro to the Periodic Table Notes
What are the names of the columns
and rows on the periodic table?
Families vs. Periods
•
Families = columns
–
•
Families have similar properties
- There are 18 families
Periods = horizontal rows
- There are 7 periods
There are two ways to number
the periodic table:
What is the difference between a
metal and a nonmetal?
•
•
Metals
vs.
Found to the left of
the “zig-zag” line on
the Periodic Table
Properties of Metals
- Luster: shine
- Malleable: can be
hammered into
sheets
- Ductile: can be
drawn into a wire
- Good conductors –
allow heat and
electricity to pass
through
Nonmetals
•
•
Non-metals and
noble gases are
found to the right of
the “zig-zag” line
Their properties are
the opposite of
metals
Families on the periodic table have
similar properties
• Example: Alkali Metals
– Soft
– Cut with a knife
– Highly Reactive
Why do the families of elements
have similar properties?
Valence Electrons
• Elements in the same family have the same
number of valence electrons
• Impacts how they bond and why they have
similar properties
Metalloids (Semi-Metals)
•
Most of the elements touching the zig-zag
line
•
B, Si, Ge, As, Sb, Te, and At
•
They have similar properties of metals and
some properties of non-metals
Periodic Table Activity
Recreating the periodic table
Periodic Table Activity Directions
• Work with your row to complete the activity
• Arrange the known elements on the cards
into the order of the periodic table
– Place them in the families and periods they are
found in
• Place the unknown’s in their spot based on
the properties of the elements
Discussion
1. What process did you use to arrange your
unknowns on the periodic table?
2. Did some properties help determine the
unknowns more than others?
3. Were there any exceptions with the
elements?
Answers
Unknown
Element
1
Mg
2
F
3
Rb
4
Kr
5
S
6
Ge
7
Sb
History of the Periodic Table
Johann Dobereiner (1829)
• Law of Triads - in triads of elements the middle
element has properties that are an average of the
other two members when ordered by the atomic
weight
• Examples:
– halogen triad composed of chlorine, bromine, and
iodine
– Alkali triad composed of lithium, sodium, and
potassium
John Newlands (1864)
• Law of Octaves - states that any given
element will exhibit analogous behavior to the
eighth element following it in the periodic
table
Dmitri Mendeleev (1871)
• Developed the first Periodic Table
• He arranged his table so that elements
in the same column (groups) have
similar properties; increasing atomic
mass
Dmitri Mendeleev (1871)
•
•
•
Broke the trend of arranging elements solely
by their atomic mass
Wanted to keep elements with similar
properties in the same columns
Left gaps in his early tables; predicted
elements that had not been discovered
would fill in those gaps
- Ekasilicon  Germanium
- Germanium was discovered in 1886
Henry Moseley (1913)
• Periodic Law - when elements are arranged in
order of increasing atomic number, their physical
and chemical properties show a periodic
(repeating) pattern
• The periodic law is the basis for arranging
elements in the periodic table
Glenn Seaborg
• He reconfigured the periodic table by placing
the actinide series below the lanthanide series
• Awarded a Nobel Prize in 1951
• Element 106, Seaborgium (Sg), is named in his
honor
Exit Ticket
The Mole Refresher!
• How many moles of Au are in 2.24 x 1024
atoms of Au?