Answer
Verified
386.8k+ views
Hint: Dmitry Mendeleev was a Russian chemist and proposed the first periodic table to the world. He proposed that the most fundamental property was the mass of the atom and positioned them in its increasing order in horizontal row till he came up against an element which had properties related close to the first element. This was the main cause of the limitations to the periodic table.
Complete Solution :
Mendeleev’s periodic law is grounded on “the chemical and physical properties of elements are a periodic function of their atomic masses”
The limitations or defects in Mendeleev’s periodic classification are mentioned below-
Despite being a historic achievement Mendeleev’s periodic table had some defects in it. The following were the main defects in it:
1. Position of hydrogen
Hydrogen resembles alkali metals as well as halogens. Therefore, it could neither be placed with alkali metals nor with halogens.
2. Position of isotopes
Each of the isotopes of the same elements should have been given a different position in the periodic table. Rather they are chemically similar, they had to be given the same position.
3. Anomalous pairs of elements
An element of higher atomic mass has been placed before an element of lower atomic mass at some places in the periodic table. For example, Argon (39.91) is positioned before (39.1)
Note: Mendeleev’s periodic table had some blank spaces in it. These unoccupied spaces were for elements that were yet to be found out. It was a very successful attempt. He put forward the existence of an unspecified element that he called eka-aluminium. The element gallium came across us four years later and its properties complimented very closely with the speculated properties of eka-aluminium.
Complete Solution :
Mendeleev’s periodic law is grounded on “the chemical and physical properties of elements are a periodic function of their atomic masses”
The limitations or defects in Mendeleev’s periodic classification are mentioned below-
Despite being a historic achievement Mendeleev’s periodic table had some defects in it. The following were the main defects in it:
1. Position of hydrogen
Hydrogen resembles alkali metals as well as halogens. Therefore, it could neither be placed with alkali metals nor with halogens.
2. Position of isotopes
Each of the isotopes of the same elements should have been given a different position in the periodic table. Rather they are chemically similar, they had to be given the same position.
3. Anomalous pairs of elements
An element of higher atomic mass has been placed before an element of lower atomic mass at some places in the periodic table. For example, Argon (39.91) is positioned before (39.1)
Note: Mendeleev’s periodic table had some blank spaces in it. These unoccupied spaces were for elements that were yet to be found out. It was a very successful attempt. He put forward the existence of an unspecified element that he called eka-aluminium. The element gallium came across us four years later and its properties complimented very closely with the speculated properties of eka-aluminium.
Recently Updated Pages
How many sigma and pi bonds are present in HCequiv class 11 chemistry CBSE
Mark and label the given geoinformation on the outline class 11 social science CBSE
When people say No pun intended what does that mea class 8 english CBSE
Name the states which share their boundary with Indias class 9 social science CBSE
Give an account of the Northern Plains of India class 9 social science CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Trending doubts
Which are the Top 10 Largest Countries of the World?
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Difference Between Plant Cell and Animal Cell
Give 10 examples for herbs , shrubs , climbers , creepers
Differentiate between homogeneous and heterogeneous class 12 chemistry CBSE
The Equation xxx + 2 is Satisfied when x is Equal to Class 10 Maths
How do you graph the function fx 4x class 9 maths CBSE
Write a letter to the principal requesting him to grant class 10 english CBSE