Platinum.
The element you are referring to is magnesium. It is found in seawater in the form of magnesium ions and is commonly extracted for various uses. Additionally, magnesium is often used in sacrificial electrodes in cathodic protection systems due to its ability to corrode preferentially, thus protecting other metal structures from corrosion.
Platinum is an inert metal often used in electrodes due to its stability and resistance to corrosion. It is commonly used in medical devices, fuel cells, and laboratory equipment.
Basic celetape found in most stores.
The element is found in your teeth is Calcium.
The element silver was found in the 700 bc.
The main element in coal is carbon.
Carbonarc lamps use carbon rods as electrodes, which produce an electric arc that generates light.
The densest element found on Earth is osmium.
This element is calcium.
Element.
Element