Question

Differentiate between men deletes periodic table and modern periodic table

Answer 1

In mendeleev's periodic table :-

i) only 56 known elements were there.

ii) isotopes didn't found any separate places in this table. example:- 17CL35 and 17CL37.

iii) elements are arranged in order of their atomic masses in this table.

In modern periodic table:-

i) 118 elements are known. Hence, it is now completely filled.

ii) isotopes do find separate places in this table.

iii) elements are arranged according to their atomic number in this table.