railway RRB NTPC Mock Test Series 2024-25 (CBT 1 + CBT 2) General Science Chemistry Periodic Table

Iron which resembles Cobalt and Nickel in properties has been placed far away from these elements. This was one of the limitations of:

1
Mendeleev's periodic table
2
Dobereiner's triads
3
Modern periodic table
4
Newlands' law of octaves
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