Assertion ( A) : Modern periodic table is known as the long form of the periodic table
Reason ( R) : Modern periodic table consists of seven groups and eighteen periods

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Both A and R are true and R is the correct explanation of A

Both A and R are true and R is not correct explanation of A

A is correct and R is incorrect

A is incorrect and R is correct

answer is C.

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Detailed Solution

Modern periodic table is known as the long form of the periodic table because it consists of eighteen groups and seven periods. The modern periodic table is called “long form of periodic table since in comparision to Mendeleev’s periodic table it is longer and have capacity to hold not only accomdate those elements which have been discovered but also which are yet to be discovered.

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