* Carbon (C)

* Hydrogen (H)

* Oxygen (O)

* Nitrogen (N)

* Magnesium (Mg)

Chlorophyll is a complex molecule with a porphyrin ring structure. The central magnesium atom is coordinated to four nitrogen atoms in the porphyrin ring, and the molecule also contains a long hydrocarbon tail.

It's worth noting that the presence of magnesium is crucial for chlorophyll's function. It allows the molecule to absorb light energy, which is then used in photosynthesis.