Write about
1/-Dobereiner's triad
2/--
Newland's law of Octave
3/--
Lothar Meyer arrangement
Write about with one example each
Answers
DOBEREINER'S
TRIAD-------------------~~~~~~~~
according to it, similar property elements are arranged in a group of 3 elements in increasing order of their atomic mass atomic and mass of middle element is the nearest Arithmetic mean of other two elements.
EXAMPLE-----
Li , Na & K
NEWLAND'S
LAW
OF OCTAVE---------~~~~~~~~~~
according to it 8 elements are arranged in in order of their increasing atomic mass and the property of first element is similar to the property of next coming 8th element.
EXAMPLE--------
Li , Be , B , C ,N , O , F ,Na
here property of Lithium and sodium are similar.
At the time of newland inert gases are not discovered.
LOTHAR- MEYER
ARRANGEMENT ----------~~~~~~~~~
according to it elements are arranged in increasing order of their atomic mass where position of element is similar according to their properties.
EXAMPLE------
graphical representation in between its physical property with atomic mass.
Answer:
Explanation:
Dobereiner's Triads;
According to this rule of triads , the atomic mass of middle element is average or mean of rest two element.
It is soon discarded because it is not followed for heavy metals.
EX- lithium, sodium , pottasium.
Average of lithium and sodium is equal to sodium approx
NEW LAND'S LAW OF OCTAVE;
According to this newland make his own periodic table in which he arranged element in octave (8serie)
In according to atomic mass.The property of 8th element is equal to first one.
It is equal to music sting too.
Ex-be mg ca;
Lothar Meyer Arrangements;
Lothar Meyer studied physical properties such as melting point atomic volume etc.and plotted the value of these physical quantities against atomic weight obtained in periodically pattern.
Ex-Be,B,Li
Lie on same plane in graph.
The element which occupied same place on slope have same properties.
Graph is in attachment
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