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Will & Deni McIntyre/Science Source
REVISIT THE PHENOMENON
What can we learn from
the periodic table?
CER
Claim, Evidence, Reasoning
Explain Your Reasoning
Revisit the claim you made when you encountered the
phenomenon. Summarize the evidence you gathered from your investigations and
research and finalize your Summary Table. Does your evidence support your claim? If not,
revise your claim. Explain why your evidence supports your claim.
STEM UNIT PROJECT
Now that you’ve completed the module, revisit your STEM unit project. You will
apply your evidence from this module and complete your project.
Module Wrap-Up
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THREE-DIMENSIONAL THINKING
GO FURTHER
Data Analysis Lab
Can you predict the properties of an element?
Francium was discovered in 1939, but its existence was pre-
dicted by Mendeleev in the 1870s. It is the least stable of the
first 101 elements, with a half-life of just 22 minutes for its
most stable isotope. Use the properties of other alkali metals,
shown in the table, to predict some of francium’s properties.
CER
Analyze and Interpret Data
Use the given information about the known properties of the
alkali metals to devise a method for predicting the
corresponding properties of francium.
1.
Claim, Evidence, Reasoning
Devise an approach that clearly
displays the trends for each of the properties given in the
table and allows you to extrapolate a value for francium. Use
the periodic law as a guide.
2.
Claim, Evidence, Reasoning
Predict whether francium is a
solid, a liquid, or a gas. How can you support your prediction?
3.
Infer
which column of data presents the greatest possible
error in making a prediction. Explain.
4.
Determine
why producing 1 million francium atoms per
second is not enough to make measurements, such as
density or melting point.
Alkali Metals Data
Element
Melting
Point (°C)
Boiling
Point (°C)
Radius
(pm)
Lithium 180.5 1342 152
Sodium 97.8 883 186
Potassium 63.4 759 227
Rubidium
39.3 688 248
Cesium 28.4 671
265
Francium ?
?
?
Module 5 • The Periodic Table and Periodic Law
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