What were the limitations of Dobereigner's Traid and Mendeleev's period table?
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Newlands' Law of Octaves deals with elements that are eight spaces apart. In the late 1800s, John Newlands put the known elements at the time in order of increasing atomic mass. He noticed that elements that were eight spaces apart had similar chemical andphysical properties.
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Limitation
- He could identify only three triads from the elements known at that time. Hence, it was not useful.
- Law of octaves was applicable only up to calcium
- It did not provide clear structure of atom
- Dobereiner could find only three triads; .i.e total of 9 elements only.
- However the total number of elements were more than that of those encompassed in Dobereiner’s Triad.
- Thus, Dobereiner’s could not be classify most of the elements known at that time.
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