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Historical Development of the Periodic Table
Historical Development of the Periodic Table
4.1
Development of Periodic Table of Elements
The Periodic Table of Elements
Classifies known chemical elements in a table according to certain characteristics.
Classification of Elements
The chemists try to develop and make a generalisation of the element by classifying it into a certain characteristic.
The classification will enable scientists;
to generalise the chemical and physical properties.
to predict the position of an element.
to identify and compare elements from a different group.
to predict chemical and physical properties.
Contribution of Scientists to the Development of the Periodic Table
Antoine Lavoisier
Group the element into four groups, which are gas, metal, non-metal and metal oxide.
Light and heat are included in the classification.
Some elements are in the wrong group because of different chemical properties.
Johann W. Dobereiner
Group the elements into three which are called as a triad.
Discovers the relationship between the relative atomic mass (RAM) of the element in each triad.
However, this relationship does not apply to most of the other elements.
John Newlands
Arranged the elements in order of increasing nucleon number.
The chemical properties of every eight elements are similar, and it is known as the law of octaves.
The classification was a failure because of:
The law of octaves was only accurate for the first 16 elements.
There was no position allocated for elements yet to be discovered.
Lothar Meyer
Calculated the volume of an atom by dividing the mass with the density of the element.
Dmitri Mendeleev
Arranged the elements in order of increasing atomic mass.
The arrangement followed the atomic mass but not the chemical properties.
Henry G.J. Moseley
Bombarded different elements with high energy electrons and measured the frequency of the X-ray emitted by the element.
Plotted the square root of the frequency of the X-ray against the proton number.
Managed to get a straight line graph.
Basic Principle of Arrangement of Elements in the Periodic Table of Elements
Elements in the Periodic Table of Elements are arranged in ascending order of proton numbers, ranging from 1 to 118.
Elements with similar chemical properties are placed in the same vertical columns
Discovery of New Elements
Element
Symbol
Number of Proton
Nihonium
Nh
113
Moscovium
Mc
115
Tennessine
Ts
117
Oganesson
Og
118
Historical Development of the Periodic Table
4.1
Development of Periodic Table of Elements
The Periodic Table of Elements
Classifies known chemical elements in a table according to certain characteristics.
Classification of Elements
The chemists try to develop and make a generalisation of the element by classifying it into a certain characteristic.
The classification will enable scientists;
to generalise the chemical and physical properties.
to predict the position of an element.
to identify and compare elements from a different group.
to predict chemical and physical properties.
Contribution of Scientists to the Development of the Periodic Table
Antoine Lavoisier
Group the element into four groups, which are gas, metal, non-metal and metal oxide.
Light and heat are included in the classification.
Some elements are in the wrong group because of different chemical properties.
Johann W. Dobereiner
Group the elements into three which are called as a triad.
Discovers the relationship between the relative atomic mass (RAM) of the element in each triad.
However, this relationship does not apply to most of the other elements.
John Newlands
Arranged the elements in order of increasing nucleon number.
The chemical properties of every eight elements are similar, and it is known as the law of octaves.
The classification was a failure because of:
The law of octaves was only accurate for the first 16 elements.
There was no position allocated for elements yet to be discovered.
Lothar Meyer
Calculated the volume of an atom by dividing the mass with the density of the element.
Dmitri Mendeleev
Arranged the elements in order of increasing atomic mass.
The arrangement followed the atomic mass but not the chemical properties.
Henry G.J. Moseley
Bombarded different elements with high energy electrons and measured the frequency of the X-ray emitted by the element.
Plotted the square root of the frequency of the X-ray against the proton number.
Managed to get a straight line graph.
Basic Principle of Arrangement of Elements in the Periodic Table of Elements
Elements in the Periodic Table of Elements are arranged in ascending order of proton numbers, ranging from 1 to 118.
Elements with similar chemical properties are placed in the same vertical columns
Discovery of New Elements
Element
Symbol
Number of Proton
Nihonium
Nh
113
Moscovium
Mc
115
Tennessine
Ts
117
Oganesson
Og
118
Chapter : Periodic Table of Elements
Topic : Development of Periodic Table of Elements
Form 4
Chemistry
View all notes for Chemistry Form 4
Related notes
The Arrangement of Elements in the Modern Periodic Table of Elements
Elements in Group 18
Elements in Group 1
Elements in Group 17
Elements in Period 3
Transition Elements
Development in Chemistry Field
Scientific Investigation in Chemistry
Usage, Management and Handling of Apparatus and Materials
Basic Concept of Matter
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