explain mendeleev limitations
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Following are the limitations of Mendeleev’s periodic table:
Position of hydrogen was not justified in Mendeleev’s periodic table.
He positioned hydrogen in the first column above alkali metals. He did so because hydrogen and alkali metals have similar properties. However, hydrogen also resembles halogens in many ways. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). Therefore, Mendeleev was not able to explain the position of hydrogen.
The discovery of isotopes revealed another limitation of Mendeleev’s periodic table.
Since Mendeleev’s periodic table was based on atomic masses of elements, isotopes should be placed in different columns despite the fact that they represent the same element.
Although Mendeleev arranged the elements in the increasing order of their atomic masses, there were instances where he placed an element with a slightly higher atomic mass before an element with a slightly lower atomic mass. For example, cobalt, whose atomic mass is 58.9, was placed before nickel whose atomic mass is 58.7
Position of hydrogen was not justified in Mendeleev’s periodic table.
He positioned hydrogen in the first column above alkali metals. He did so because hydrogen and alkali metals have similar properties. However, hydrogen also resembles halogens in many ways. Like halogens, hydrogen is a gas, and exists as a diatomic molecule (H2). Therefore, Mendeleev was not able to explain the position of hydrogen.
The discovery of isotopes revealed another limitation of Mendeleev’s periodic table.
Since Mendeleev’s periodic table was based on atomic masses of elements, isotopes should be placed in different columns despite the fact that they represent the same element.
Although Mendeleev arranged the elements in the increasing order of their atomic masses, there were instances where he placed an element with a slightly higher atomic mass before an element with a slightly lower atomic mass. For example, cobalt, whose atomic mass is 58.9, was placed before nickel whose atomic mass is 58.7
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LIMITATIONS OF MENDELEEV PERIODIC
TABLE ATE GIVEN BELOW:-
1) HE COULD NOT GIVE A FIXED POSITION
TO HYDROGEN.
2)HE LEFT MANY SPACE IN TABLE
3)HE COULD GIVE POSITION TO ISOBAR
TABLE ATE GIVEN BELOW:-
1) HE COULD NOT GIVE A FIXED POSITION
TO HYDROGEN.
2)HE LEFT MANY SPACE IN TABLE
3)HE COULD GIVE POSITION TO ISOBAR
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