give two points of differences between modern periodic table and Mendeleev periodic table
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Answer:
Explanation: Mendeleev's periodic table Modern periodic table
Mendeleev's periodic table is based on atomic mass
Modern periodic table is based on atomic number
Mendaleev's periodic table contains about 66 elements.
Modern periodic table contains about 112 elements
In Mendeleev's periodic table there were gaps for undiscovered elements.
Modern periodic table maintains uniformity.
In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time).
In Modern periodic table noble gases in a seperate group named as group-18.
In Mendeleev's periodic table transition elements included with other elements
In Modern periodic table transition elements placed in separate block.
Answer: Here is your answer mate..
The main difference between Mendeleev and Modern Periodic Table is that-
Mendeleev’s periodic table had gaps for the missing elements at that time.
Modern periodic table has no concept as such.
Mendeleev’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.
Mendeleev’s periodic table orders the elements based on their atomic weight.
Modern periodic table orders the elements based on their atomic number.