Question

Statement 1: The mass of middle element was roughly the average of atomic masses of other two elements in the triad.
Statement 2 : Elements in a triad show similar properties.

• A. Both statement 1 and statement 2 are wrong.
• B. Both statement 1 and statement 2 are correct.
• C. Only statement 1 is correct.
• D. Only statement 2 is correct.

Answer 1

The correct option is B Both statement 1 and statement 2 are correct.

Dobereiner classified elements with similar properties in group of 3 known as triads. He also stated in his law of triads that the arithmetic mean of the atomic masses of the first and third element in a triad would be approximately equal to the atomic mass of the second element in that triad.