The element present in the porphyrin structure of chlorophyll molecules are

Solution(By Examveda Team)

The element present in the porphyrin structure of chlorophyll molecules is Magnesium and nitrogen, with each molecule containing 6.7% magnesium.
Nitrogen is also a component of the chlorophyll molecule, which enables the plant to capture sunlight energy by photosynthesis, driving plant growth and grain yield. Nitrogen plays a critical role within the plant to ensure energy is available when and where the plant needs it to optimize yield.
Chlorophyll pigment in the leaves absorbs the sunlight that excites the electrons in the molecules, enabling them to be transferred to other molecules. Chlorophyll and magnesium are connected in this step because magnesium helps the molecule absorb light and keeps the electrons in an excited state so that they can be transferred.