Answer:
Titanium
Step-by-step explanation:
Titanium has a tensile strength of 63,000 PSI. Its tensile-strength-to-density ratio is higher than any natural metal, even tungsten, but it scores lower on the Mohs scale of hardness. It is also extraordinarily resistant to corrosion. Chromium, on the Mohs scale for hardness, is the hardest metal around.
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