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The following are some statements about ...

The following are some statements about Mendeleeff's periodic table
(i) It is based on increasing order of atomic numbers.
(ii) Mendeleef corrected the atomic weight of some elements like Be, In etc
(iii) `(Ar, H_(2)), (Co, CI_(2)), (Te, F_(2))` are three inverted pairs
(iv) It is based on increasing order of atomic weights

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