This notes contain a fundamental concept of the topic
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Cis2a) ·
middle element in the hid has argatomic mass
the next two
among
·
The properties are also middle blu 2 elements
·
worked for only few elements
.
3 A E B
.
.
de Chancourtois :
(1862) ·
arranged in increasing order of atomic
weight and formed
table of
a
cylindrical elements
.
4 Law of Octaves :
(1865)· John Alexander Newlands
·
arranged in increasing order of atomic mass and found every
elements has similar properly to 1st element
eight
·
It is live only up
to Calcium
Davy medal for this From Royal London
got society in 1887
·
.
5 Lothar Meyer :
(1868) ·
Lothar and mendeleer worked same time
meyer on
elements increasing atomic and found
·
meyer arranged in
weight
but
repeated patterns the
length of repeated pattern changes
·
He made a table which closely resembles Modern Periodic table
·
This work was not published until after Mendeleer
6. Mendeleer's periodic law :
The properties of the elements are a
periodic function
of their atomic weight
-
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