Multiple Choice
How many elements are classified as metalloids on the periodic table?
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2. Atoms & Elements
Periodic Table: Classifications
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Who is credited with arranging the periodic table by atomic number?
A
Henry Moseley
B
Antoine Lavoisier
C
Dmitri Mendeleev
D
John Dalton
Verified step by step guidance1
Understand that the periodic table was initially arranged by atomic mass by Dmitri Mendeleev, who is credited with creating the first widely recognized periodic table.
Recognize that the modern periodic table is arranged by atomic number, which is the number of protons in an atom's nucleus.
Identify Henry Moseley as the scientist who discovered the concept of atomic number through his work with X-ray spectra of elements.
Know that Moseley's work showed that the properties of elements are better correlated with atomic number rather than atomic mass, leading to the modern arrangement of the periodic table.
Conclude that Henry Moseley is credited with arranging the periodic table by atomic number.
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