write down five major differences between mendeleev's periodic table and modern periodic table
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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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