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| 1. |
Write short notes on Newlands’ Octaves |
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Answer» i. Newlands was next after Dobereiner who attempted to classify elements according to their properties. ii. Newlands arranged all the 56 existing elements at that time in an increasing order of their atomic masses. iii. He found that every eighth element had properties similar to that of the first as observed in musical octaves. iv. For example:
In the above example, properties of elements belonging to each vertical group are similar. In the first group, properties of H, F and Cl are similar. In the second group, properties of Li, Na and K are similar and so on. v. However, Newlands’ octave law was not successful in classifying all the discovered elements. vi. After calcium, every eighth element did not possess properties similar to that of the first in the octaves. |
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