📝 Multiple Choice Question
General-science
Elements in the Modern Periodic Table are arranged in vertical columns called groups and horizontal rows called periods.
A
18,7
B
16,7
C
18,9
D
16,9
Explanation
The IUPAC-approved modern periodic table features exactly 18 vertical groups that categorize elements displaying similar chemical behaviors. It also prominently features 7 horizontal periods, which directly correspond to the principal energy levels occupied by the elements' electrons.
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