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Write the limitations of Mendeleev's periodic table?
 
i.  with significant differences in properties were grouped. (Soft metals like sodium and potassium were mixed in with hard metals like copper and silver).

ii. The  hydrogen could not be assigned to a specific position. ( was placed in between the metals).

iii. Throughout the experiment, the increasing order of was not strictly followed.

iv. have no place in the periodic table.