Assertion (A) Mendeleev's arranged elements in horizontal rows and vertical columns.
Reason (R) Mendeleev's ignored the order of atomic weight thinking that the atomic measurements might be incorrect.

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Both A and R are correct; R is the correct explanation of A.

Both A and R are correct; and R is not the correct explanation of A.

A is correct; R is incorrect

R is correct; A is incorrect

answer is B.

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Detailed Solution

Mendeleev's arranged elements in horizontal rows and vertical columns. He ignored the order of atomic weight thinking that the atomic measurements might be incorrect and placed the elements with similar properties.

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