[Answer] 2. There are four allotropes of carbon. One is famous for its hardness. In this form of carbon, each carbon bonds with four others. What is this allotrope commonly known as?

Step 1 : Introduction to the question "2. There are four allotropes of carbon. One is famous for its hardness. In this form of carbon, each carbon bonds with four others. What is this allotrope commonly known as?"

...1. corundum 2. diamond 3. graphite 4. ruby Diamond's unique properties are due to its structure and the small size of the carbon atom. Silicon forms the same structure as diamond, but is not nearly as hard, probably because the small size of the carbon atom allows stronger bonding.

Step 2 : Answer to the question "2. There are four allotropes of carbon. One is famous for its hardness. In this form of carbon, each carbon bonds with four others. What is this allotrope commonly known as?"

diamond:

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