Assertion:According to mendeleev,the properties of elements are a periodic function of their atomic weights.
Reason:Mendeleev left the gap under aluminium and a gap under silicon,and called these elements Eka-Aluminium and Eka-silicon.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. if assertion is true and reason is false.
D. both are false

Answer

B

Explanation

Mendeleev proposed the law on the basis that on arranging elements in the increasing order of their atomic weights,similarities appear In physical and chemical properties at regular intervals.