Which metal is at the center of chlorophyll?

Chlorophyll (also chlorophyl) is any of several related green pigments found in cyanobacteria and in the chloroplasts of algae and plants. Its name is derived from the Greek words khloros ("pale green") and phyllon ("leaf"). Chlorophyll allows plants to absorb energy from light.

Chlorophyll was first isolated and named by Joseph Bienaimé Caventou and Pierre Joseph Pelletier in 1817. The presence of magnesium in chlorophyll was discovered in 1906, and was the first detection of that element in living tissue.