Multiple Choice
In the simplified atomic model, most of an atom is best described as which of the following?
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4. Atoms and Elements
The Atom (Simplified)
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Which number determines how the modern periodic table is arranged?
A
Mass number (protons plus neutrons)
B
Number of neutrons
C
Atomic number (number of protons)
D
Number of valence electrons
Verified step by step guidance1
Understand that the modern periodic table is arranged based on a specific atomic property of elements.
Recall that the atomic number represents the number of protons in an atom's nucleus.
Recognize that the atomic number uniquely identifies each element and determines its position in the periodic table.
Note that while mass number (protons plus neutrons) and number of neutrons vary among isotopes, they do not determine the element's placement.
Conclude that the periodic table is arranged in order of increasing atomic number, which reflects the number of protons.
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