Q.

According to IUPAC, total number of groups and periods in the periodic table respectively are

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a

16, 9

b

18, 7

c

18, 9

d

13, 7

answer is B.

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Detailed Solution

According to the recommendation of IUPAC, the groups are numbered from 1 to 18, while the periodic are numbered from 1 to 7, i.e. total number of groups is 18 and total number of periods is 7.
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According to IUPAC, total number of groups and periods in the periodic table respectively are