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How are elements on the periodic table arranged?
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4. Atoms and Elements
Periodic Table: Classifications
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How were the elements in Dmitri Mendeleev's first periodic table arranged?
A
By increasing atomic mass, with elements of similar chemical properties grouped together
B
By increasing density, with elements of similar chemical properties grouped together
C
By alphabetical order of element names, with elements of similar chemical properties grouped together
D
By increasing atomic number, with elements of similar chemical properties grouped together
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Understand the historical context: Dmitri Mendeleev created the first periodic table in the 19th century before the discovery of the atomic number.
Recall that Mendeleev arranged elements primarily based on their increasing atomic mass because the concept of atomic number was not yet known.
Note that Mendeleev grouped elements with similar chemical properties into columns (groups) to highlight periodic trends.
Recognize that this arrangement allowed Mendeleev to predict the existence and properties of undiscovered elements by leaving gaps in his table.
Conclude that the correct arrangement is by increasing atomic mass, with elements of similar chemical properties grouped together.
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