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.

Both statement 1 and statement 2 are correct.

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Only statement 2 is correct.

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Both statement 1 and statement 2 are wrong.

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Only statement 1 is correct.

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Solution

The correct option is A 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.

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Similar questions

In Dobereiner's triads, when three elements in a triad are written in the increasing order of atomic masses; the atomic mass of the middle element is roughly the average of the atomic masses of the other two elements. Identify ‘X’ from the given triad.
Li (6.9), Na (X), K (39.0)

Q. According to Dobereiner's theory of triads, the mass of middle element was roughly the average of atomic masses of other two elements.

Q. Three elements calcium, strontium, and barium from a Döbereiner's triad. What is the basis on which these elements are arranged in a triad?
i. Elements are in the increasing order of their atomic weights.
ii. The atomic mass of the middle element is equal to the average of the atomic mass of other two elements.
iii. Elements in a triad have similar physical and chemical properties.

Which scientist stated that the atomic mass of the middle element was roughly the average of the atomic masses of the other two elements?

In a Dobereiner’s triad, the respective atomic masses of the first and the last elements are 40 and 137

What is the mass of the middle element of the triad?

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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.

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.