Multiple Choice
Which of the following sets of elements has the most similar physical and chemical properties?
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2. Atoms & Elements
Periodic Table: Classifications
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Who arranged the periodic table in order of increasing atomic number?
A
Henry Moseley
B
Dmitri Mendeleev
C
John Dalton
D
Lothar Meyer
Verified step by step guidance1
Understand the historical context of the periodic table: Dmitri Mendeleev originally arranged elements by increasing atomic mass, which led to some inconsistencies.
Recognize that Henry Moseley conducted experiments using X-ray spectra to determine the atomic number of elements, which is the number of protons in the nucleus.
Learn that Moseley discovered a clear relationship between the atomic number and the properties of elements, which resolved the inconsistencies in Mendeleev's table.
Conclude that Henry Moseley arranged the periodic table in order of increasing atomic number, rather than atomic mass, leading to the modern periodic table.
Note that John Dalton and Lothar Meyer contributed to atomic theory and early periodic classifications but did not arrange the table by atomic number.
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