Write down five major differences between Mendeleev's. Periodic tab – InterviewSolution

1.

Write down five major differences between Mendeleev's. Periodic table and Modern Periodic Table.

Answer»

S. No.	Mendeleev's Period Table	Modern Periodic Table
(i)	Elements have been arranged in increasing order of atomic masses.	Element have been arranged in increasing order of their atomic number.
(ii)	It consists of 8 groups.	It consists of 18 groups.
(iii)	All the groups from I to VIII are divided into two sub-groups	No sub-groups.
(iv)	He left some gaps in the table for undiscovered elements	All elements are filled in increasing order of atomic number. No gaps Ieft in the periodic table.
(v)	Isotopes were placed in different groups.	Isotopes were placed ln same group.

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