Periodic Chart/periodic Trends Unit
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4HONORS CHEMISTRY: WESTERN ALAMANCE HS
D.C. VERNON
PERIODIC CHART/PERIODIC TRENDS UNIT
ATOMIC RADII ASSIGNMENT
DATA ANALYSIS:Refer to the chart in this packet labeled "Atomic Radii Trends"
NOTE: for all questions, disregard Hydrogen
Define the term atomic radius.
What are the symbols and atomic numbers of the elements through which the vertical lines pass? Give the name of
this group of elements.
What are the the symbols and atomic numbers of the elements with the smallest atomic radius within each section of
the graph? Give the name of this group of elements.
What are the symbols and atomic numbers of the elements with the largest atomic radius within each section of the
graph? Give the name of this group of elements.
What are the the symbols and atomic number of the elements in which 3d orbitals are filling?
Note the regular, repeating pattern in each section of the graph. How can you explain this pattern? [Call upon your
knowledge of electron configurations.]
What is true about the trend in atomic radius as the atomic number increases within a vertical column [group] of
elements? (ie: in going from Li to K in the alaki metals?)
What is true about the trend in atomic radius as the atomic number increases with each section [period] of the graph?
(ie: in going from Na to Ar on the 3rd period)
What can you say about the trend in atomic radius as the atomic number increases while d orbitals are filling? (in
going from Sc to Zn)
The trends in atomic radius vs. atomic number continue throughout the rest of the elements in the periodic table.
Tell which corner of the periodic table [upper left, upper right, lower left, or lower right] you would find:
a.the largest elements.
b.the smallest elements.
IONIZATION ENERGY ASSIGNMENT
DATA ANALYSIS:Refer to the chart in this packet labeled "Ionization Energy"
NOTE: Disregard Hydrogen in all of the questions
Define ionization energy.
What are the symbols and atomic numbers of the elements through which the vertical lines pass? Name this group
of elements.
What are the symbols and atomic numbers of the elements with the lowest ionization energy within each section of
the graph? Name this group of elements.
What are the symbols and atomic numbers of the next–to–highest ionization energy within each section of the
graph? Name this group of elements.
If an element has a large ionization energy compared to another element, would it be relatively easy or relatively hard
to remove an electron from an atom of this element? (compared to the one with low ionization energy)
What can you say about the effect of increasing atomic number on ionization energy within a group of elements?
(for example, do the alaki metals increase in ionization energy as one moves from Li to K OR from K to Li?)
What can you say about the effect of increasing atomic number on the ionization energy within each section [period]
of the graph?(for example, do the 3rd period elements increase in ionization energy as one moves from Na to Ar OR
from Ar to Na?)
The trends in ionization energy vs. atomic number continue throughout the rest of the elements in the periodic table.
Tell which corner of the periodic table [upper left, upper right, lower left, or lower right] you would find:
a.the elements with the largest ionization energy.
b.the elements with the smallest ionization energy.
c.the elements that are the easiest to remove electrons from.
d.the elements that are the hardest to remove electrons from.
Describe the pattern formed by your graph. How can you explain the pattern using your knowledge of electron
configurations?
Compare the graph of ionization energy and the graph of atomic radii. What can you conclude about the trend shown
by these two properties as plotted against atomic number?
a.How can you explain this trend using your knowledge of electron configurations?
b.Why are the same elements grouped together again and again when properties are plotted
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