Magnesium is 12th on the periodic table.
There are 6 protons, 12.31 neutrons, and 6 electrons.
The atomic mass is 24.31
Magnesium is a micronutrient, which means it is needed to sustain good health and vigor in plants.
It is found in abundance in the minerals brucite, magnesite, dolomite, and carnallite.
It is significant for chlorophyll-production and most enzyme reactions. It is responsible for healthy leaf-structure and -production, & sustaining healthy vein-structure in the leaves.
The most common symptoms are a vivid yellowing of the leaves, followed by leaves falling without withering, starting with the older/lower leaves.
If a plant is deficient in magnesium then you can add different kinds of fertilizer such as Epsom salts.