alleryIn Mendeleev's periodic table, the vertical columns and horizontal rows are respectively called:
ABlocks and series
BPeriods and groups
CGroups and periods
DSeries and blocks
Answer & Solution
Correct answer: C. Groups and periods
1. Mendeleev organised elements into a grid of rows and columns.
2. The vertical columns are named groups.
3. The horizontal rows are named periods.
4. Rule out B: it reverses the correct pairing.
_Source: Balbharati (Maharashtra Board) Class 10 Science & Technology, Ch 2 "Periodic Classification of Elements", p.27_
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