Question

Differentiate between the arrangement of elements in Mendeleev’s periodic table
and Modern periodic table.

Answer 1

Mendeleev's periodic table
1)It is based on the atomic mass.
2) All elements where not present in his periodic table.
3)position of hydrogen.
4) position of zero group or inert gas was not there.
Modern periodic table
It is based on atomic number.
position of Hydrogen also not fixed
3)position of inert gas or zero group fixed.
4)All the elements are mostly present

Answer 2

MENDELEEV'S PERIODIC TABLE:
1.Elements are arranged in increasing order of their atomic mass.
2.it had 6 periods and 18 groups.
3. same elements are allotted in different groups in some places.
4.different elements are allotted in same group.
MODERN PERIODIC TABLE:
1.Elements are arranged in increasing order of their atomic number.
2.it has 7 periods and 18 groups.
3.it has proper position for hydrogen
4.it has proper position for lantanoides and actinoides.