Question

What is the difference between Modern periodic table and Mandeleev periodic table..

Write 5 differences....


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Answer 1

Answer:

• Modern Periodic Table
• the elements arranged periodically in the increasing order of their atomic number
• there are 7 periods and 18 groups
• in each element box the symbol of element atomic number mass number density the valency electronic configuration extermination
• elements are divided into four blocks there is block P block D block F block
• 18 group is called inert gas or noble gas

• Mendeleev periodic table
• no fixed position can be given to hydrogen in the periodic table
• isotopes are discovered
• atomic mass do not increase in a regular manner in going from one element to the next

Answer 2

Answer:

LIMITATIONS OF Mendeleev's Periodic Table : Position of Hydrogen => Position of hydrogen in the perodic table is Uncertain , Because hydrogen is placed in 1 A group with Alkali metals . Position of isotopes => isotopes haven't been given separate place in perodic table