Hook: True or False?
1. The periodic table is the only way to classify the
elements.
2. Most elements are metals.
3. Most elements are gases at room temperature.
4. The periodic table can be used to make predictions
about the products formed in chemical reactions.
5. Most non-metallic elements are gases at 20°C.
6. The metals are on the right of the periodic table.
Did you get the right answers??
1. F
2. T
3. F
4. T
5. T
6. F
The development of the periodic
table
Line of enquiry:
• How has the arrangement of the periodic
table developed over time?
• Can I describe what different scientists have
contributed to the periodic table?
• Can I create a timeline justifying the changes
in the periodic table over time?
The periodic table is a beautiful
thing!!
3 mins
Have a look at your periodic table on your data sheet- how
many patterns can you find?
Line of enquiry:
•
How has the arrangement of the periodic table developed over time?
•
Can I describe what different scientists have contributed to the periodic table?
•
Can I create a timeline justifying the changes in the periodic table over time?
Dalton’s table of elements (1808)
• Only had 20 known elements
• Dalton arranged the elements in order of
their mass
Line of enquiry:
•
How has the arrangement of the periodic table developed over time?
•
Can I describe what different scientists have contributed to the periodic table?
•
Can I create a timeline justifying the changes in the periodic table over time?
Newland’s octaves(1864)
• Newland arranged the
elements in rows of 8
after observing that
every 8th element
seemed to have similar
properties
•Some elements still hadn’t
been discovered
•Some of the elements in
the same columns didn’t
have similar properties
•Some of the elements
were paired to try to fit the
pattern
Line of enquiry:
•
How has the arrangement of the periodic table developed over time?
•
Can I describe what different scientists have contributed to the periodic table?
•
Can I create a timeline justifying the changes in the periodic table over time?
Mendeleev!.... “the father of the modern
periodic table” (1869)
• Russian Mendeleev arranged the 50 elements that were then
known in order of atomic mass
• He also arranged them according to their chemical and physical
properties
• The important bit!: He left gaps predicting that new elements would
be found that would fit the properties.... And they were!
• He did such a good job that he had an element named after him...
Who can guess it?
Line of enquiry:
•
How has the arrangement of the periodic table developed over time?
•
Can I describe what different scientists have contributed to the periodic table?
•
Can I create a timeline justifying the changes in the periodic table over time?
https://www.youtube.com/watch?v=fPnwBITSmgU
https://www.youtube.com/watch?v=O-48znAg7VE
Line of enquiry:
•
How has the arrangement of the periodic table developed over time?
•
Can I describe what different scientists have contributed to the periodic table?
•
Can I create a timeline justifying the changes in the periodic table over time?
The development of the periodic
table
Line of enquiry:
• How has the arrangement of the periodic
table has developed over time?
• Can I describe what different scientists have
contributed to the periodic table?
• Can I create a timeline justifying the changes
in the periodic table over time?
What would Mendeleev do!?
Mendeleev left gaps
He recognised that some elements were yet to be
discovered
4 new elements (W, X, Y and Z) have been
discovered and information about them is around
the room.
Use your knowledge to evaluate their properties and
decide where they should go!
9
10
8
5
1
3
7
4
2
6
What did you decide??
W- 3, 4
X- 9, 6
Y- 1, 2
Z- 5
Your H/W task: research the scientists that have
contributed to the development of the periodic
table and use it to complete the table below
Scientist
What was known Features of their
about the
table
elements
Dalton
Newland
Mendeleev
Line of enquiry:
•
How has the arrangement of the periodic table developed over time?
•
Can I describe what different scientists have contributed to the periodic table?
•
Can I create a timeline justifying the changes in the periodic table over time?
The development of the periodic
table
Line of enquiry:
• How has the arrangement of the periodic
table has developed over time?
• Can I describe what different scientists have
contributed to the periodic table?
• Can I create a timeline justifying the changes
in the periodic table over time?
Thinker: Test your knowledge of Newlands &
Mendeleev
• Take the test!
Line of enquiry:
•
How has the arrangement of the periodic table developed over time?
•
Can I describe what different scientists have contributed to the periodic table?
•
Can I create a timeline justifying the changes in the periodic table over time?
Compare and contrast the Mendeleevs periodic table with the
modern periodic table. You must relate this to what was known at
the time each table was developed
Starting with Dalton, explain why the periodic table has changed so
much over time
Describe how the modern periodic table has developed from
Daltons table
State the differences between Mendeleevs periodic and the modern
periodic table