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Artificial photosynthesis: putting sunshine in the tank

Flying sources bring transition metals

The modern world needs transition metals (TMs) in ever-increasing amounts. However, many sources of them are nearing exhaustion. Tony Hargreaves looks at where we might find more

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The terms in red link to topics in the AQA, Edexcel, OCR, WJEC and CCEA A-level specifications, as well as the SQA exam specifications.

Transition metals are found in d-block (groups 3–12) of the periodic table. They have partly filled d-shells (with the exception of zinc, cadmium and mercury) which give rise to the elements having more than one oxidation state. This makes them ideal catalysts. Their varied colours are due to d-d electronic transitions, which you might have seen when performing flame tests.

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Artificial photosynthesis: putting sunshine in the tank

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