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Answered 2014-07-05 20:59:54

They are not actually detached. They are only put at the bottom to condense the periodic table more reasonably. If you look at a picture of the extended periodic table you would see that they are right in there with the transition metals

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There are 14 lanthanides and 14 actinides in periodic table. They are placed at the bottom of periodic table.



There are seven periods in the periodic table. Other two rows comprises of lanthanides and actinides.


These elements are termed as 'lanthanides' and 'actinides' have certain different characteristics that cannot be fitted into modern periodic table,hence they are placed at the bottom.


Henry Moseley created modern periodic table. He added actinides to it.


limitation of modern periodic table 1 1.Hydrogen resembles both the alkali metals and halogens. But it has been placed with the alkalis. 2.The lanthanides and actinides have not been placed in the main body of the table.


Drawbacks of modern periodic table: 1.Hydrogen resembles both the alkali metals and halogens But it has been placed with the alkalis. 2.The lanthanides and actinides have not been placed in the main body of the table. 3.Place of Multivalent elements is not sure in the modern periodic table.


it is because the lanthinides and actinides have there prepenultimate shell complete to acquire stability as they are stable by completing there pre-- penultimate shell ,,,they gain stability...As far as other elements are conCERND completion of their penultimate or ultimate shell,,gives them stability so they are outside the table penultimate shell --- shell inner to valence or outermost or ultimate shell ultimate shell--outermost shell


In the periodic table of the elements there are 7 periods and 18 groups. The rows are called periods and columns are called groups. You may be getting confused by the lanthanides and actinides. These groups of elements are found in two rows at the bottom and seem to not be a part of the table. However, if you find and extended version of the table you will see that, technically, these two rows belong in Periods 6 and 7.


The elements in the modern periodic tables have been arranged on the basis of their atomic numbers.


Isotopes are atoms of same element having different atomic mass, but the same atomic number. Isotopes have not been given separate place in the modern periodic table.


There are 7 periods in the modern periodic table.


Ans. Mendeleev developed his statement of the periodic law and the Modern Periodic Table.


Merits of Periodic Table 1. The classification of elements is based on the atomic number, which is a more fundamental property. 2. The reason for placing isotopes at one place is justified as the classification is on the basis of atomic number. 3. It explains the periodicity of the properties of the elements and relates them to their electronic configurations. 5. The position of the elements that were misfits on the basis of mass number (anomalous pairs like argon and potassium) could be justified on the basis of atomic number. 6. The lanthanides and actinides are placed separately at the bottom of the periodic table. 7. The table is simple, systematic and easy way for remembering the properties of various elements as it is based on the electronic configuration. Demerits are 1. Position of Hydrogen is still in dispute to keep weather in Alkali, Crystallogens ,or Halogen 2. Lanthanides and Actinides are kept away from main body 3. Helium is of s-block still kept in p-block due to noble gas property


MODERN PERIODIC LAW:properties of elements are a periodic function of their atomic numbers


Modern periodic table is based on modern periodic law which states that physical and chemical properties of elemnts are periodic function of their atomic numbers.


The modern periodic table of elements is developed from the Mendeleev periodic table; but they are very compatible.


Modern periodic table is invented by Henry Moseley.


Niels Bohr prepared the modern Periodic Table.


There are 7 periods in the modern periodic table.


The modern periodic table has seven periods.


The modern periodic law states that, The properties of the elements are the periodic function of there atomic number not atomic weights.


There is 87 elements in the modern periodic table :)


the modern periodic table is arranged with a lot of numbers and letters.


The modern periodic table is arranged by increasing proton (atomic) number.