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Q.

In modified Mendeleev periodic table, total no. of groups are:

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a

8

b

9

c

18

d

12

answer is A.

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Detailed Solution

Atomic masses are the basis of Mendeleev's periodic table. His periodic table has the elements listed in increasing order of their atomic masses. The placement of similar-property elements was done sequentially.

Mendeleev's periodic table has a total of 8 groups and 7 periods.

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In modified Mendeleev periodic table, total no. of groups are: