Multiple Choice
How many periods (horizontal rows) are on the modern periodic table?
2
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4. Atoms and Elements
Periodic Table: Classifications
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How is the periodic table primarily organized?
A
By increasing atomic number (number of protons) from left to right across each period
B
By increasing atomic mass from left to right across each period
C
By grouping elements randomly based on their most common oxidation state
D
By arranging elements alphabetically by their chemical symbol
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