- 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 disadvantages 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 is the problem with modern periodic table?
→ In Modern Periodic Table there was no problem of the place of isotopes, as isotopes have same atomic mass with different atomic numbers. → Elements having same valence electron are kept in same group . → Elements having same number of shells were put under the same period.
What are the main advantage of modern periodic table?
It is easier to remember the properties of an element if its position in the periodic table is known . The periodic table has made the study of chemistry systematic and easy. It acts as an aid to memory. The type of compounds formed by an element can be predicted by knowing it position in the periodic table.
What are advantages and disadvantages of modern periodic table?
It is easy to remember and reproduce . The systematic grouping of elements into four blocks; s, p, d and f has made the study of the elements more simple. The position of some elements which were misfit on the basis of atomic mass is now justified on the basis of atomic number.
What are the advantage of long form of periodic table?
- The table is based on more fundamental property i.e. atomic number.
- The correlates the position of elements with their electronic configuration more clearly.
- The completion of each period is more logical. ...
- It eliminates the even and odd series of IV, V and VI periods of Mendleefs periodic table.
What is the benefit of Mendeleev periodic table?
It could predict the existence of other elements and could predict their properties so, as to leave space in the periodic table. It could accommodate all the sixty elements discovered at that time and could accommodate the noble gases which, where discovered later.
What are merits and demerits of Mendeleev's periodic table?
- There was a regular gradation in physical and chemical properties of elements.
- The group number of an element indicates highest oxidation state that it can attain.
- There were many vacant spaces in Mendeleev's periodic table for the elements to be discovered.
What does Mendeleev's periodic law state?
the law that the properties of the elements are periodic functions of their atomic numbers . Also called Mendeleev's law. (originally) the statement that the chemical and physical properties of the elements recur periodically when the elements are arranged in the order of their atomic weights.
Can modern periodic table solve all problems?
No, the modern periodic table cannot solve all the problem . Explanation: Modern periodic table is a better alternative than the other form of the periodic table.
Why do periodic trends exist?
These trends exist because of the similar atomic structure of the elements within their respective group families or periods , and because of the periodic nature of the elements.
Who is the father of modern periodic table?
Internet search giant Google has dedicated a Doodle to Russian chemist Dmitri Mendeleev on his 182nd birth anniversary. Born on February 8, 1834, Mendeleev is popularly known as the “Father of Periodic Table”.
What are the features of modern periodic table?
Main features:
Each column is called a group. All elements in a group have similar chemical and physical properties because they have the same number of outer electrons . Periods – In periodic table elements are arranged in a series of rows. Elements of the same period have the same number of electron shells.
What are the main features of long form of periodic table?
Main Features of the Long Form of the Periodic Table : (1) It shows arrangement of elements based on modern periodic law. (2) There are 18 vertical columns known as groups. (3) There are 7 horizontal rows known as periods.
What is modern periodic table?
Modern Periodic Table, also known as the Periodic Table, is a tabular arrangement in which chemical elements are arranged according to their atomic numbers, configuration of electrons and chemical properties . A Modern Periodic Table consists of four block, i.e., the “S”, “P”, “D” and “F” blocks.
What is the long form of periodic table?
Modern periodic table (i.e. long form of table) is based on the periodic law which says that physical and chemical properties of the elements are periodic function of their atomic numbers.
