Multiple choice

Diamond is ______ element.

  1. the hardest

  2. the softest

  3. a mixed

  4. none of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Diamond is the hardest naturally occurring substance known, ranking 10 on the Mohs scale of mineral hardness. The softest elements would be materials like talc, while 'mixed element' is not a standard classification.