Lesson 4 - Organizing the Elements
Terms in this set (8)
Describe how Mendeleev organized the elements into rows and columns in his periodic table.
Mendeleev arranged the elements in rows in order of increasing mass so that elements with similar properties were in the same column. b
How did the discovery of new elements such as gallium demonstrate the usefulness of Mendeleev's table?
The close match between Mendeleev's predictions and the actual properties of new elements showed how useful his periodic table could be.
Scientists before Mendeleev had proposed ways to organize the elements. Why were Mendeleev's efforts more successful?
Mendeleev provided an organizing principle that worked for all of the known elements.
What characteristic of solitaire did Mendeleev use as a model for his periodic table?
In solitaire, cards are arranged into categories called suits and ordered by value.
Why did Mendeleev leave spaces in his table?
In order to place elements with similar properties in the same column, Mendeleev needed to leave spaces for undiscovered elements.
In general how can a scientist test the correctness of a scientific model?
The scientist tests whether the model can be used to make accurate predictions.
Explain why it would not have been possible for a scientist in 1750 to develop a table like Mendeleev?
With only 17 known elements to work with, the scientist would not have had enough data.
How was Mendeleev able to predict he properties of elements that had not yet been discovered?
Mendeleev based his predictions on the properties of nearby elements and other elements in the same column.
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