He examined the relationship between atomic weights of the elements and their physical and chemical properties.Among chemical properties, Mendeleev mainly concentrated on the compounds formed by the elements with hydrogen and oxygen because they are highly reactive and hence formed compounds with almost all the elements.
The formulae of the hydrides and oxides formed by the various elements was made the basis of classification of elements.
Mendeleev in 1869, proposed periodic law.
It states that
The physical and chemical properties of elements are a periodic function of their atomic weights i.e. when the elements are arranged in order of their increasing atomic weight, elements with similar properties are repeated after certain regular intervals. This repetition of properties of elements after certain regular intervals is called periodicity of properties.
Characteristics of Mendeleev’s periodic table
1)Mendeleev’s arranged the then known elements in order of their increasing atomic weights, grouping together elements with similar properties and leaving out blank space wherever necessary.
2)He also made the prediction that there were some unknown elements which, would be discovered in due course of time and would fill these blank spaces.
3)He predicted their properties in the light of the properties of the other elements in the same group. Later on, these unknown elements were discovered and were found to possess exactly the same properties as predicted by Mendeleev.
4)Noble gases were not known at the time of Mendeleev. When these gases were discovered, a new group called the zero group was added toMendeleev original periodic table.
5)Two group of 14 elements each, called lanthanides and actinides were placed at the bottom of the periodic table.
6)Mendeleev’s periodic table consists of :
periodsa) 9 vertical columns called groups. These are designated as 0, 
, 
, 
, 
,
, 
, 
, 
b) Except for group 0 and ,each group is further divided into two subgroup designated as A and B.The elements which lie on the left hand side of each group constitutes sub-group A while those placed on the right hand side from sub-group B.This subdivision is made on the basis of the differences in their properties.
c)Group contains 9 elements in three sets each containing three elements. Group 0 has no subgroup. It consists of only one vertical column of inert gases.
d)7 horizontal rows called periods.These are numbered from 1 to 7.
Gaurav Seth 3 years, 11 months ago
He examined the relationship between atomic weights of the elements and their physical and chemical properties.Among chemical properties, Mendeleev mainly concentrated on the compounds formed by the elements with hydrogen and oxygen because they are highly reactive and hence formed compounds with almost all the elements.
The formulae of the hydrides and oxides formed by the various elements was made the basis of classification of elements.
Mendeleev in 1869, proposed periodic law.
It states that
The physical and chemical properties of elements are a periodic function of their atomic weights i.e. when the elements are arranged in order of their increasing atomic weight, elements with similar properties are repeated after certain regular intervals. This repetition of properties of elements after certain regular intervals is called periodicity of properties.
Characteristics of Mendeleev’s periodic table
1)Mendeleev’s arranged the then known elements in order of their increasing atomic weights, grouping together elements with similar properties and leaving out blank space wherever necessary.
2)He also made the prediction that there were some unknown elements which, would be discovered in due course of time and would fill these blank spaces.
3)He predicted their properties in the light of the properties of the other elements in the same group. Later on, these unknown elements were discovered and were found to possess exactly the same properties as predicted by Mendeleev.
4)Noble gases were not known at the time of Mendeleev. When these gases were discovered, a new group called the zero group was added toMendeleev original periodic table.
5)Two group of 14 elements each, called lanthanides and actinides were placed at the bottom of the periodic table.
6)Mendeleev’s periodic table consists of :
periodsa) 9 vertical columns called groups. These are designated as 0,
, 
, 
, 
,
, 
, 
, 
b) Except for group 0 and
,each group is further divided into two subgroup designated as A and B.The elements which lie on the left hand side of each group constitutes sub-group A while those placed on the right hand side from sub-group B.This subdivision is made on the basis of the differences in their properties.
c)Group
contains 9 elements in three sets each containing three elements. Group 0 has no subgroup. It consists of only one vertical column of inert gases.
d)7 horizontal rows called periods.These are numbered from 1 to 7.
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