Difference between mendeleev periodic table and modern periodic table
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Five major differences between Mendeleev periodic table and modern periodic table.
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Differences between Mendeleev Periodic Table and Modern Periodic Table:
Modern Periodic Table:
- In the modern periodic table all the elements are arranged in the order of increasing atomic number.
- There are 18 vertical columns in the modern periodic table and these 18 columns are called as groups.
- Noble gases like Helium, Neon, Argon etc are placed on the right hand side of the modern periodic table.
- Isotopes are kept in the same place of the modern periodic table because their atomic numbers are same.
- Transition elements are placed in group 3 to group 12. They are placed in the middle of the long period.
Mendeleev's Periodic Table:
- In Mendeleev's periodic table the elements are arranged in the order of increasing atomic mass.
- In Mendeleev's periodic table there are 9 vertical columns known as groups.
- There is no place allotted for noble gases in the modern periodic table.
- He had not given suitable places for isotopes.
- All the transition elements are placed together in group VIII of the Mendeleev's periodic table.
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