This classification did not work with heavier elements i.e., those lying beyond Calcium.Reasons for discarding the Newland's law of Octaves: Why was the law discarded?Īccording to Newland's law of octaves, when elements are arranged by increasing atomic mass, the properties of every eighth element starting from any element are a repetition of the properties of the starting element. The law did not fully apply even within the same family.Įxplain 'Newland's law of Octaves'.Dobereiner failed to arrange all the then known elements in the form of triads.(b) Reasons for discarding Dobereiner's triads: (a) When the atomic mass of A = 7, and that of C is = 39 then according to Dobereiner's triad, atomic mass of B should be mean value of atomic masses of A and C.ħ + 39 2 \dfrac 2 46 = 23 (b) Why were Dobereiner's triads discarded? If the atomic mass of A is 7 and that of C is 39, what should be the atomic mass of B? (a) A, B and C are the elements of a Dobereiner's triad. What was the basis of the earliest attempts made for classification and grouping of elements?Įarliest attempts or classification and grouping of elements were based on factors such as: It helps in defining the relationship of one element with another.It helps in correlating the properties of elements with the fundamental properties of all states of matter.It helps in studying the elements in an organized manner.Reasons for classification of elements are: What is the need for classification of elements?
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