Question

write 5 difference between mendeelev's and morden periodic table​

Answer 1

Answer:

   Mendeleev's periodic table is based on atomic mass. Modern periodic table is based on atomic number.

1.    Mendaleev's periodic table contains about 66 elements. Modern periodic table contains presently 118 elements.
2. In Mendeleev's periodic table there were gaps for undiscovered elements.Modern periodic table maintains uniformity.

3. In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time).

4.In Modern periodic table noble gases in a seperate group named as group-18.

   5.In Mendeleev's periodic table transition elements included with other elements. In Modern periodic table transition elements placed in separate block.

Explanation: