write a short note on Newland laws of octaves
Answers
Newlands divided the elements into horizontal rows. Each horizontal row had 7 elements.
For example :- let us take a row from newlands classification of elements. If we take the elements Li, B, C, N, O, F and Na , lithium ( Li ) is the first element, and Sodium is the eighth . It has been found that the properties of sodium are a repetition of the properties of lithium . In short, Both lithium and sodium have similar chemical properties.
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#akashmandal.
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Newlands’ Octave : John Newlands arranged the elements in order of their increasing atomic mass.
It states that whenever the elements are arranged in increasing order of their atomic mass, the properties of the eighth element are a kind of repetition of the first, just like the notes of music.
Limitations of Newlands’ law of octaves :
(1) The law was applicable to elements upto calcium (Ca) only.
(2) It contained only 56 elements. Further it was assumed by Newlands that only 56 elements existed in nature and no more elements are going to be discovered in the future.
(3) In order to fit these elements into the table, Newlands adjusted two elements in the same slot and also put some unlike elements under the same note.
For example, cobalt and nickel are in the same slot and these are placed in the same column as fluorine, chlorine and bromine which have very different properties than these elements.
Iron, which resembles cobalt and nickel in properties, has been placed differently away from these elements.
