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About how long ago in history did the first cities emerge?
Mg
Mg is the chemical symbol for magnesium, a lightweight, silvery-white metallic element that is essential for human biology.
K
The symbol for potassium, an essential mineral and electrolyte in the human body, or alternatively, the symbol for the kelvin, a unit of temperature.
Na
The chemical symbol for Sodium, an essential element that plays a key role in nerve function and blood pressure regulation.
Subscript
A character or symbol set or printed below the normal line of text, often used in chemical formulas to indicate the number of atoms.
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