alleryHow many periods and groups are there in the modern periodic table?
A18 periods and 7 groups
B7 periods and 18 groups
C8 periods and 7 groups
D7 periods and 8 groups
Answer & Solution
Correct answer: B. 7 periods and 18 groups
1. The modern table has horizontal rows called periods, numbered 1 to 7.
2. It has vertical columns called groups, numbered 1 to 18.
3. Hence 7 periods and 18 groups.
4. Rule out D: 7 periods, 8 groups describes Mendeleev's older table.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.30_
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