Multiple Choice
Periodic Table: Classifications — How many periods (horizontal rows) are in the modern periodic table?
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4. Atoms and Elements
Periodic Table: Classifications
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How is the modern periodic table primarily arranged?
A
By grouping elements only by physical state at room temperature (solid, liquid, gas)
B
By increasing atomic number (number of protons)
C
By increasing atomic mass for all elements
D
Alphabetically by element name
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