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Q.

How many vertical columns are there in the Mendeléev’s periodic table?
 

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a

25

b

20

c

15

d

9

answer is D.

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Detailed Solution

Concept: There are nine groups indicated by Roman Numerals as I, II, III, IV, V, VI, VII, VIII, and zero, and the elements belonging to the first seven groups have been divided into sub-groups designated as A and B on the basis of similarities in properties.
Hence there are 9 vertical columns in Mendeléev’s periodic table

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How many vertical columns are there in the Mendeléev’s periodic table?