What is the difference between Modern periodic table and Mandeleev periodic table..
Write 5 differences....
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- 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
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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
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