Question

Differentiate between the arrangement of elements in Mendeleev's periodic table and modern perodic table

Answer 1

mendeleev arrange the element according to increasing atomic mass whereas in modern periodic table mosley represent element as increasing atomic no.

Answer 2

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 transiti