Identify the cation present in chlorophyll in green plants.

Step-by-step solution

Chlorophyll is a green pigment found in plants, algae, and cyanobacteria, which is essential for photosynthesis. Structurally, chlorophyll is a coordination complex consisting of a substituted porphyrin ring (specifically a chlorin ring) with a central metal ion. The central metal ion coordinated in the porphyrin ring of chlorophyll is magnesium, specifically in the +2 oxidation state. Thus, the cation present in chlorophyll is Mg ²⁺ . Answer: Mg ²⁺