Multiple Choice
How are elements arranged on the modern periodic table?
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4. Atoms and Elements
Periodic Table: Classifications
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How are elements primarily arranged in the modern periodic table?
A
By increasing atomic number (number of protons)
B
By increasing atomic mass
C
Alphabetically by element name
D
By increasing number of neutrons
Verified step by step guidance1
Understand that the modern periodic table is organized to reflect the properties of elements and their atomic structure.
Recall that the atomic number of an element is the number of protons in its nucleus, which uniquely identifies each element.
Recognize that the periodic table is arranged in order of increasing atomic number, not atomic mass, because atomic number determines the element's identity and chemical behavior.
Note that arranging elements by atomic number groups elements with similar chemical properties into columns called groups or families.
Conclude that the primary arrangement principle of the modern periodic table is by increasing atomic number (number of protons).
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