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The porphyrin ring has a metal atom "" i...

The porphyrin ring has a metal atom `"____"` in the centre.

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**Step-by-Step Solution:** 1. **Understanding the Porphyrin Ring**: The porphyrin ring is a large cyclic structure that is crucial in various biological processes, including photosynthesis. It consists of smaller units called pyrroles. 2. **Composition of the Porphyrin Ring**: The porphyrin ring is made up of four pyrrole molecules, which are smaller rings containing four carbon atoms and one nitrogen atom. These pyrroles are interconnected through a series of single and double bonds, forming a larger ring structure. 3. **Identifying the Central Metal Atom**: In the case of chlorophyll, which is the pigment responsible for photosynthesis, the porphyrin ring contains a specific metal atom at its center. ...
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