alleryStart learning →How many groups does the modern periodic table contain?
A18
B8
C16
D7
Answer & Solution
Correct answer: A. 18
1. The modern table has 18 vertical columns.
2. Each column is called a group.
3. Old Mendeleev tables had only 8 groups.
4. So the modern count is 18.
_Source: Selina Concise Chemistry ICSE Class 9, Ch 5 'The Periodic Table'_
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