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Q.

Number of vertical columns in the modern periodic table are:

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a

7   

b

8   

c

10   

d

18 

answer is D.

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Detailed Solution

●        In a modern periodic table, the arrangement of elements is usually done in 18 groups and 7periods.
●        A modern periodic table usually has 18 vertical columns.
●        In a modern periodic table, 18 groups are grouped together to form a complete vertical column, called a group.
 
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