Can someone please explain what is transition element type in

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The Transition Metals (GCSE Chemistry) - Study Mind

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Explain:i) Why do transition elements show variable oxidation state?ii) Give two differences between Lanthanide and Actinide.

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Transition metal chemistry 16–18, Resource

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What are transition elements?

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Why transition elements are called transition elements? - Quora

Transition metal - Wikipedia

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