MCQ practice · SSC Chemistry Board questions · Chapter 4: Periodic Table
How many vertical columns are there in the periodic table?
Think it through first, then pick an option.
- a 7
- b 8
- c 18
- d 32
Answer and explanation
Correct answer: c 18
The modern table has 18 vertical columns, the groups.
Why the other options are wrong
- a 7: 7 is the number of periods, the horizontal rows. The answer is 18.
- b 8: 8 columns were in Mendeleev's chart. The answer is 18.
- d 32: 32 is the number of elements in periods 6 and 7. The answer is 18.
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