Early Periodic Table

A Word Document showing the advantages and disadvanages of each stage of the production of the periodic table

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  • Created on: 28-04-10 09:00
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Early Stages of the Periodic Table
John Newlands
How they arranged table ­ Newlands recognised that the elements have a repeating
pattern of properties when grouped according to their atomic mass. His table of
elements has eight group and the elements at the top of the table have lower
atomic massed than those lower down. In 1866, a British scientist, Newlands,
reported his "law of octave" by arranging elements according to increasing order of
their atomic masses. He noticed that "Every eight element, starting form any point,
approximately has similar properties". Newland's arrangement was applicable only to
a few elements after that it was failed.
Advantages ­ It was one of the first periodic tables and when it was released, it
contained most of the known elements. It was also arranged in a n order of atomic
mass, and set in a table, not just written down
1. This law provided a basis for the classification of element into groups of elements
having similar properties.
2. This law provided a wider scope to arrange all known elements into a tabular form
Disadvantages ­
1. Newland's law is not applicable to all the elements.
2. This arrangement did not include NOBLE GASES because they were not discovered
3. Heavier elements could not be accommodated
Lothar Meyer
How they arranged table ­ Meyer is best known for the share he had in the periodic
classification of the elements. He noted, as did J. A. R. Newlands in England, that if
they are arranged in the order of their atomic weights they fall into groups in which
similar chemical and physical properties are repeated at periodic intervals; and in
particular he showed that if the atomic weights are plotted as ordinates and the
atomic volumes as abscissae, the curve obtained presents a series of maxima and

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Finally, Meyer never came to the idea of predicting
new elements and correcting atomic weights. Only a few months after Mendeleev
published his periodic table of all known elements (and predicted several new
elements to complete the table, plus some corrected atomic weights), Meyer
published a virtually identical table
B=11.0 Al=27.3 -- ?In=113.4 Tl=202
-- -- --
C=11.97 Si =28 -- Sn=117.8 Pb=20
Ti=48 Zr=89.7 --
N=14.01 P=30.9 As=74.9 Sb=122.1 Bi=20
V=51.2 Nb=93.7 Ta=182.2
O=15.96 S=31.…read more

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Dmitri Mendeleev
How they arranged table ­ Mendeleev divided elements into eight groups (the
columns) and then listed periods (the rows) of elements. As in Newlands' table, the
elements at the top have lower atomic masses than those lower down. He
concentrated on the chemical properties of elements for this classification, putting
elements with similar properties I the same group.
The elements in the columns all have similar properties.…read more

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Mendeleev's arrangement helped to correct atomic masses of a number of
Disadvantages ­
1. For placing the elements in proper groups, the order of the elements according to
atomic mass was reversed in certain cases. He placed Iodine (127) after Tellurium
(128) Potassium (39) and Ni (58) after Co (59). Which is against his periodic law but
correct according to properties.
2. Mendeleev's periodic table does not provide a clear idea about the structure of
3.…read more


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