📝 Multiple Choice Question
General-science
How many vertical columns are present in the modern periodic table?
A
16
B
14
C
20
D
18
Explanation
The standard, IUPAC-approved modern periodic table is organized into exactly 18 vertical columns, formally referred to as 'groups' or 'families'. Elements clustered within the same group share identical valence electron configurations, granting them extremely similar chemical properties.
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