Question

Dobereiners law and newland law of octave according to 0th

Answer 1

dobereiner- according to dobereiner when 3 elements in a traid were written in the order of increasing atomic masses,the atomic mass of middle element was roughly the average of atomic masses of other 2 elements. Newland's law of octave- newland found that every 8' th element had properties similar to that of the first.

Answer 2

dobereiner's trends:

when the elements were written in order of increasing atomic masses, the atomic masses of the middle was the average of atomic masses of other two elements

limitations:

only three traits were recognised from the elements known at that time

atomic masses of an element is the relative mass of its atomic

Newlands law of octaves:

he arranged the elements based on increasing atomic masses

when elements are arranged he found that every 8th element had properties similar to that of 1st element

same as Indian musical notes

SA. RE. GA. MA. PA. THA NE. SA.

{first note (SA) is similar to 8th note(SA)}

ex: properties of sodium and lithium are same

limitations:

applicable only upto calcium

properties of new elements could not fit on it

in some cases, properties of the elements were not same as he defined

(ex: Fe was placed far away from Co &Ni)

worked well only with lighter elements