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Asked by Anuj A

Mar 1, 2015

Difference between Mendeleev's periodic table and modern periodic table

Difference between mendeleevs periodic table & mordern periodic table

Answers(3)

Answer

Syeda

Member since Jan 25, 2017

Answer.

Mendeleev's periodic table Modern periodic table
Mendeleev's periodic table is based on atomic mass
Modern periodic table is based on atomic number
Mendaleev's periodic table contains about 66 elements.
Modern periodic table contains about 112 elements
In Mendeleev's  periodic table there were gaps for undiscovered elements.
Modern periodic table maintains uniformity.
In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time). In Modern periodic table noble gases in a seperate group named as group-18.
In Mendeleev's periodic table transition elements included with other elements In Modern periodic table transition elements  placed in separate block.

Satyanarayana Prasad

Member since Apr 24, 2013

Ans:

Mendeleev's periodic table Modern periodic table
Mendeleev's periodic table is based on atomic mass
Modern periodic table is based on atomic number
Mendaleev's periodic table contains about 66 elements.
Modern periodic table contains about 112 elements
In Mendeleev's  periodic table there were gaps for undiscovered elements.
Modern periodic table maintains uniformity.
In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time). In Modern periodic table noble gases in a seperate group named as group-18.
In Mendeleev's periodic table transition elements included with other elements In Modern periodic table transition elements  placed in separate block.

Vinayak Kumbar

in mendeleeves periodic table elements were classified on the basis of atomic mass but in modern periodic table it is based on atomic number
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