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Newlands’ Law of Octaves
In 1864, Newlands arranged the known 56 elements in the order of increasing atomic masses.He observed that the properties of every eighth element are similar to the properties of the first element.Based on this observation, he proposed the Law of Octaves for the classification of elements.Law of Octaves: When elements are arranged in the increasing order of atomic masses, the properties of every eighth element are similar to the first.
Limitations
Newland could arrange elements only up to calcium out of total 56 elements known.After calcium every eighth element did not possess properties similar to that of the first.Only 56 elements were known at the time of Newlands but later several elements were discovered.In order to fit the existing elements, Newlands placed two elements in the same position which differed in their properties.For example, iron, which resembles cobalt and nickel in its properties, is placed far away from these elements.The periodic table did not include inert gases because they were not discovered.
In 1864, Newlands arranged the known 56 elements in the order of increasing atomic masses.He observed that the properties of every eighth element are similar to the properties of the first element.Based on this observation, he proposed the Law of Octaves for the classification of elements.Law of Octaves: When elements are arranged in the increasing order of atomic masses, the properties of every eighth element are similar to the first.
Limitations
Newland could arrange elements only up to calcium out of total 56 elements known.After calcium every eighth element did not possess properties similar to that of the first.Only 56 elements were known at the time of Newlands but later several elements were discovered.In order to fit the existing elements, Newlands placed two elements in the same position which differed in their properties.For example, iron, which resembles cobalt and nickel in its properties, is placed far away from these elements.The periodic table did not include inert gases because they were not discovered.
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