which one is the defect of Mendeleev periodic table
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Anomalous pair of elements
Certain elements of highest atomic weights precede those with lower atomic weights
Example-tellurium (atomic weight 127.6) precedes iodine (atomic weight 126.9).
Dissimilar elements placed together
elements with dissimilar properties were placed in same group as sub group-A,sub group-B
Certain elements of highest atomic weights precede those with lower atomic weights
Example-tellurium (atomic weight 127.6) precedes iodine (atomic weight 126.9).
Dissimilar elements placed together
elements with dissimilar properties were placed in same group as sub group-A,sub group-B
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Hey !!
DEFECTS OF MENDELEEV'S PERIODIC TABLE
- Position of hydrogen in the periodic table was not correctly defined.
- In certain pair of elements the increasing order of atomic masses was not obeyed. Isotopes have not been given separate places in the periodic table.
- Some similar elements were separated and dissimilar elements were grouped together.
- Mendeleev could not explain the cause of periodicity among the elements.
GOOD LUCK !!
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