Answers

2015-02-10T19:28:32+05:30

This Is a Certified Answer

×
Certified answers contain reliable, trustworthy information vouched for by a hand-picked team of experts. Brainly has millions of high quality answers, all of them carefully moderated by our most trusted community members, but certified answers are the finest of the finest.
Elements are classified in mendleeve's periodic table in the order of their increasing atomic masses.
merits :-
1. his prediction about discovery of new elements were proved correct.
2. he left gaps in his table so that new elements could be easily fitted.
3. nobel gases could be placed in his table without disturbing other elements

demerits:-
1. he couldn't define the position of hydrogen and isotopes
2. at some places in his table he put the element with more atomic mass before the element with less atomic mass.
0
  • Brainly User
2015-02-10T19:38:37+05:30
Merits are: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

DEMERITS 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.
0