What are the merits and demerits of modern periodic?

(i) The modern periodic table is based on the atomic numbers of elements which is the most fundamental property of elements. (ii) It helps us to understand why elements in a group show similar properties but elements in different groups show different properties.

What are the demerits of modern periodic table Class 10?

What are the disadvantages of modern periodic table?

• Position of hydrogen is not satisfactory, it can be placed either in group I or 17 group of the first period.
• It fails to accommodate lathanides and actinides in the main body of the periodic table. These are kept separately at the bottom of the periodic table.

What are the merits and demerits of long form of periodic table?

(i) Long form periodic table is based upon the atomic numbers which is more fundamental properties of the atom. (ii) It relates the position of an element in the periodic table with its electronic configuration. (iii) It removes all the anomalies and drawbacks of the Mendeleef’s table.

What is disadvantage of periodic table?

Positioning of hydrogen has still not been setteled. (It’s still in 1st group with metals but has properties like non-metals) Lanthanides and actinides have not yet been placed in the main body of periodic table.

Which are the demerits of Mendeleev periodic table?

Demerits of Mendeleev Periodic Table

• He was unable to locate hydrogen in the periodic table.
• Increase in atomic mass was not regular while moving from one element to another.
• Later on, isotopes of elements were found which violated Mendeleev’s periodic law.

What are the disadvantages of the long form periodic table?

Drawbacks of the long form of periodic table:

• The position of hydrogen is not justified. It resembles alkali metals and halogens both but it is placed with alkali metals.
• There is no place for isotopes.
• f-block that is lanthanides and actinides have not been placed in the main body of the periodic table.

What were the two major demerits associated with his periodic table?

What are the demerits of Mendeleev periodic table any 3?

The demerits are:

• He did not gave place to isotopes.
• Position of rare earths and actinides could not be justified.
• Certain pairs of elements having higher atomic weights have been given position before the elements having lower atomic weights.

What are the demerits of Mendeleev periodic table Shaalaa?

i) Mendeleev’s periodic law could not explain the position of isotopes in the periodic table. ii) Mendeleev’s periodic law could not assign a proper position to the element hydrogen in the periodic table. iii) Mendeleev’s periodic law failed to explain the wrong order of atomic masses of some elements.

What is long form periodic table?

Long Form of Periodic Table. The modern or long form of the periodic table is based on the modern periodic law. The table is the arrangement of elements in increasing order of their atomic numbers. The modern periodic table is the present form of the periodic table.

Why does the F block appear in the 6th row?

Explain why the “f-block” does not appear until the 6th row, and why it fits in-between the “s” and “d” blocks. Electrons in the F sublevel have energies that are higher than the ‘s-block” two levels up. The F sublevels fill after s and before d in the atom.

What are the merits and demerits of the modern periodic table?

Originally Answered: What are the merits and demerits of the modern periodic table? 1. The classification of elements is based on the atomic number, which is a more fundamental property. 2. It explains the periodicity of the properties of the elements and relates them to their electronic configurations.

What do you mean by modern periodic table?

Definition of Modern Periodic Table. A systematic arrangement of elements into groups and periods based on similarities in chemical properties and the order of their increasing atomic number is called a modern periodic table. This arrangement is known as the long form of the periodic table.

What were the limitations of Mendeleev’s periodic table?

Mendeleev was not been able to place the Lanthanoids and the Actaboids in his table as that time he was not able to match therr behavior with any other group of elements and so he He was not been able to explain hwy he kept the hydrogen in the top of the periodic table and he has not put the hydrogen within any other rows of elements.

What is the position of hydrogen in the periodic table?

Position of hydrogen is not satisfactory, it can be placed either in group I or 17 group of the first period. It fails to accommodate lathanides and actinides in the main body of the periodic table. These are kept separately at the bottom of the periodic table.