When chemists discuss the periodic nature of the elements they focus on mainly the 'representative elements'.
Find two websites that discuss the Periodic Table. Provide a short evaluation of the Periodic table based on the information provided at the site. Provide the urls for each website. Finally, explain what the 'representative elements' are and why they are used to explain trends more than transition elements.© BrainMass Inc. brainmass.com October 24, 2018, 10:46 pm ad1c9bdddf
The periodic table categorizes all the ...
Almost 100 words and 2 links for further reading explains the concept of using representative elements more than transition elements to illustrate trends.
Equivalence relations, surjective maps, partitions and fibers.
Consider any surjective map f from a set X onto another set Y. We can define a relation on X by x_1 ~ x_2 if f(x_1) = f(x_2). Check that this is an equivalence relation. Show that the associated partition of X is the partition into "fibers" f^(-1) (y) for y in Y.
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