Skip to main content

Limitations of Mendeleev's Periodic Table

Mendeleev arranged 63 elements known at that time in the periodic table. According to Mendeleev “the properties of the elements are a periodic function of their atomic masses.” The table consists of eight vertical column called ‘groups’ and horizontal rows called ‘periods’
Limitations of mendeleev’s classification :
(i) He could not assign a correct position of hydrogen in his periodic table, as the properties of hydrogen resembles both with alkali metals as well as with halogens.
(ii) The isotopes of the same element will be given different position if atomic number is taken as basis, which will disturb the symmetry of the periodic table.
(iii) The atomic masses do not increases in a regular manner in going from one elements to the next.
So it was not possible to predict how many elements could be discovered between two elements.
Labels:

Comments

  1. Unknown14 March 2018 at 10:33

    Best answer on Google

    ReplyDelete
  2. Fix PS4 Error17 July 2018 at 22:21

    Get chemistry notes from here: Periodic Table | SEE Class 10 | Chemistry Notes

    ReplyDelete
    Replies
    1. Unknown3 January 2020 at 07:31

      Nice to store in mind

      Delete
    2. Arup kumar das3 March 2020 at 18:58

      Thanks Sir but I want the smallest papers link...of CBSE questions paper...

      Delete
  3. Unknown13 August 2018 at 07:25

    Niceee easy to learn

    ReplyDelete
  4. Unknown19 August 2018 at 01:07

    This is amazing

    ReplyDelete
  5. Unknown5 October 2018 at 13:22

    Very easy yr

    ReplyDelete
  6. Unknown1 November 2018 at 20:55

    It is easy to understand

    ReplyDelete
  7. Unknown9 November 2018 at 22:29

    The (ii) is wrong
    It should be atomic mass not atomic number.

    ReplyDelete
  8. Unknown28 November 2018 at 06:50

    Thank uhh

    ReplyDelete
  9. Unknown28 November 2018 at 09:14

    It is really useful
    Thank you

    ReplyDelete
  10. Unknown29 November 2018 at 07:16

    Thank you it makes easy to understand

    ReplyDelete
    Replies
    1. Anonymous13 February 2020 at 01:41

      Not so good but helpfull

      Delete
    2. Anonymous13 February 2020 at 01:41

      Not so good but helpfull

      Delete
  11. Srirangmetre AM GLPSKURNALLI11 December 2018 at 14:30

    Tq very much

    ReplyDelete
  12. Unknown13 December 2018 at 05:38

    In the second point, it is atomic mass and not atomic no.

    ReplyDelete
    Replies
    1. Unknown23 February 2019 at 03:40

      Yes you are correct.

      Delete
    2. Himanshu Mishra7 October 2020 at 13:26

      Actually that is right. What I was suggesting is that if we took atomic number as reference, then the isotopes will have a different position which can not be done with taking atomic mass as a reference.

      Delete
  13. Unknown16 December 2018 at 22:19

    Thank u for the info

    ReplyDelete
  14. Unknown29 December 2018 at 10:27

    Easy to learn
    Thanks

    ReplyDelete
  15. bees16 February 2019 at 02:25

    it is easy to understand

    ReplyDelete
  16. Unknown18 March 2019 at 11:27

    👍👍😊

    ReplyDelete
  17. Unknown2 May 2019 at 10:45

    thanks

    ReplyDelete
  18. Unknown2 June 2019 at 07:43

    I think in (ii) there will be atomic mass not atomic no. Please clerify me

    ReplyDelete
  19. Unknown7 October 2019 at 23:16

    Thanks for your hhelp

    ReplyDelete
  20. Unknown20 October 2019 at 08:00

    Thanks

    ReplyDelete
  21. Unknown18 November 2019 at 18:52

    Very good explanations it is ...thank you

    ReplyDelete
  22. Unknown27 April 2020 at 05:16

    nice


    ReplyDelete
  23. Unknown11 October 2020 at 18:32

    Thanks for giving us nice concept

    ReplyDelete
  24. Unknown3 February 2021 at 05:22

    In (ii) it is atomic mass not atomic number and overall answer is good and easy so i will give this anwer 4/5 one mark cut for point(ii)

    ReplyDelete

Post a Comment

Popular posts from this blog

Semiconductors and Communication System

This chapter can be divided into following categories:- Classification Types of Semi-Conductors p-n junction diode Biasing of Diode Rectifiers Special Diodes (Zener, Photodiode, LED and Solar Cell) Transistors Logic Gates Communication System In the next few posts I will be posting in the same manner ie. (in bullets form) for your convenience and I hope that helps you in completing your syllabus. Classification Materials can be classified on the basis of conductivity as Conductors, Insulators and Semi Conductors. The basic difference among all the three is the difference of energy in between the Conducting and the Valence band. This can be seen here. Note- The range of conductivity should be kept in mind. For Semi-Conductors the energy difference is not very large but not even very less. So by providing proper conditions they can show conductivity. Types of Semi-Conductors Further we can say that there are two other types of semi con...
1 comment
Go ahead for more »

Solid States of Matter

STATES OF MATTER We can classify matters into 3 types:- Solids  Liquids  Gas In this chapter, we will be discussing only Solids. SOLIDS In our daily life, we see many types of solid objects. Some of which can easily break and some of which are very hard. Some with a very shiny surface and some with no lustre at all. These are some of the physical features of a solid. They can be classified into two types on the basis of there crystal type:- Crystalline  Amorphous  Crystalline types are those whose structure is ordered in the entire Lattice. For Example, Diamond, Crystalline Glass etc. Amorphous are those whose structure is not ordered or ordered in a very small region. For Example, Graphite, Glass, etc. The Crystalline solids have a different unit constituent. The lattices formed by these units are called Bravais Lattices . There are basically 14 types of lattices. I have uploaded the structures from Wikipedia and no need t...
2 comments
Go ahead for more »

Apologies for late posts

Dear Friends, I am really sorry for the late posting of the posts and I feel that it might have somehow been a problem to all of you. Hence I promise you that I will be posting at least three topics revision notes on my blog every week. I wanted to do more but due to my own schedule I am unable to push it further. I have got high hopes from this blog and now being in college I can devote myself to this blog even more. Just to let you know, from now onwards this blog will mostly be a go to place for those students who are looking for some reliable resource from where they can get enough revision for there weekly tests or phase tests or any related tests of JEE/NEET. I was also a JEE aspirant but due to my lack of note making, I could not get into the IIT's. But nevertheless, I am now a student of DTU civil branch and I strongly recommend you all to make proper notes and go through them as this creates the difference between an IITian and the rest. But still, if due to some reaso...
Post a Comment
Go ahead for more »