project file on transition elements
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one of the group of metals in the centre of the periodic table. Transition metals are heavy, they melt only at high temperatures, they form coloured compounds, they can combine with another element to form more than one compound, and they often act as a catalyst
The transition elements are those elements having a partially filled d or f subshell in any common oxidation state. The term "transition elements" most commonly refers to the d-block transition elements...They have several oxidation states. They usually form colored compounds.
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