Assertion: Dobereiner arranged the elements with similar properties into groups having three elements each; called as Dobereiner’s triads.
Reason: The atomic mass of the middle element was roughly the average of the atomic masses of the other two elements.
a) Both A and R are true, and R is correct explanation of the assertion.
b) Both A and R are true, but R is not the correct explanation of the assertion.
c) A is true, but R is false.
d) A is false, but R is true.
