- Chrome
On the Mohs scale, which measures the resistance of chemical elements to scratches, chromium is in the top five, second only to boron, diamond, and tungsten. Chromium is prized for its high corrosion resistance and hardness. It is easier to handle than platinum group metals and is more common, which is why chromium is a popular element used in alloys such as stainless steel. And one of the hardest metals on earth is used in dietary supplements. Of course, you will not be taking pure chromium internally, but its food compound with other substances (for example, chromium picolinate)… (read more)
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