How many groups are there in the modern long form of the periodic table?
(a) 7
(b) 17
(c) 15
(d) 18
WBBSE
Class X
Physical Science
Periodic Table
01 Mark
2025
(d) 18
Explanation
The modern long form of the periodic table consists of 18 vertical columns, called groups, and 7 horizontal rows, called periods.
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