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TRANSITION ELEMENTS
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Mendeleef placed nine elements (Fe, Co, Ni, Ru, Pd, Os, Ir and Pt) in group VIII because there was no suitable place for them in the periodic table.
Example
After 55Mn, 56Fe should have been placed below 39K in group 1, but Fe did not resemble K at all. Hence Mendeleef suggested the name Transition Elements for these group elements.
Example
After 55Mn, 56Fe should have been placed below 39K in group 1, but Fe did not resemble K at all. Hence Mendeleef suggested the name Transition Elements for these group elements.
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