How many groups are there in modern long form of 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 has 18 vertical columns called groups, accommodating 118 elements by increasing atomic number.
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