Question

Which of the following statements are true regarding Dobereiner's periodic table?
1..The elements are written in the increasing order of atomic masses.
2..Similar elements occur after an interval of seven elements.
3..The mass of middle element was roughly the average of atomic masses of other two elements
4..Elements in a triad show similar properties.​

Answer 1

Answer:

Which of the following statements are true regarding Dobereiner's periodic table?

3..The mass of middle element was roughly the average of atomic masses of other two elements True

4..Elements in a triad show similar properties True

Answer 2

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Option 3 and also Option 4

The mass of middle element was the average of atomic masses of other two elements and Elements in a triad show similar properties.

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