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AssignmentMultiple Choice

Atomic Theory

Question 1 • GA-GSE Physical Science A

What is the major difference between the periodic table created by Dmitri Mendeleev and the one created by Henry Moseley?

Answer
A
Moseley arranged the elements in order of increasing atomic mass.
B
Moseley ignored variations resulting from isotopes.
C
Moseley arranged the elements in order of increasing atomic number.
D
Moseley divided the elements into four categories.

Explanation

Mendeleev arranged elements mainly by increasing atomic mass, while Moseley organized them by increasing atomic number, the number of protons in an atom. This change fixed some inconsistencies in the order based on atomic mass, so the correct choice is that Moseley arranged the elements in order of increasing atomic number.

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