Difference between arrangement of element in mendeleev periodic table and modern periodictable
Answers
The properties of the elements are the periodic function of their atomic weight.
Modern periodic table ——-
The properties of the elements are the periodic function of their atomic number.
Mendeleev’s periodic table was created on the basis of periodic functions of the elements, leaving room for future findings of the missing elements at that time.
The modern periodic table is the one used at the moment, as a collective improvement of the works of so many chemists and scientists in an effort to order the chemical elements to resemble the similarities in their properties.
Basis of OrderingMendeleev’s periodic table orders the elements based on their atomic weight.
Modern periodic table orders the elements based on their atomic number.
Gaps for Missing ElementsMendeleev’s periodic table had gaps for the missing elements at that time.
Modern periodic table has no concept as such.
Number of Columns and RowsMendeleev’s periodic table has 8 vertical columns called groups and 12 horizontal rows called periods.
Modern periodic table has 18 columns called groups and 7 rows called periods.
Characteristics of Grouped ElementsMendeleev’s periodic table has elements with dissimilar properties in the same group sometimes.
Modern periodic table’s elements have similar properties repeated at regular intervals.
Existence of IsotopesMendeleev periodic table doesn’t support the fact of the existence of isotopes.
Modern periodic table supports this fact as the classification is based upon the atomic number, rather than the atomic weight of the element.
Defining Atomic StructureMendeleev periodic table doesn’t support the concept of the atomic structure.
Modern periodic table supports this fact by grouping the elements in such a manner that their electronic configuration can be deduced easily.