MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
How many columns did Mendeleev's first periodic table have?
Think it through first, then pick an option.
- a 18
- b 12
- c 8
- d 7
Answer and explanation
Correct answer: c 8
Mendeleev's chart had 8 vertical columns.
Why the other options are wrong
- a 18: 18 vertical columns are the groups of the modern table. The answer is 8.
- b 12: 12 was the number of horizontal rows in Mendeleev's chart. The answer is 8.
- d 7: 7 is the number of periods in the modern table. The answer is 8.
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