Multiple choice

The hardest substance known so far is

  1. tungsten

  2. ferro steel

  3. platinum

  4. diamond
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Diamond is the hardest known natural material on Earth, ranking 10 on the Mohs scale of mineral hardness. Its exceptional hardness comes from its crystal structure where each carbon atom is strongly bonded to four others in a tetrahedral arrangement. Tungsten is very hard but not the hardest substance.

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