Question
Name a non-metal which is extremely hard.
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$\ \ \ \ \ \ \ \ \text{H}\ \ \ \ \ \text{O} \ \ \ \ \text{H} \ \ \ \ \ \text{H}\ \\ \ \ \ \ \ \ \ \ \ | \ \ \ \ \ \ || \ \ \ \ \ \ | \ \ \ \ \ \ | \\\text{H}-\text{C}-\text{C}-\text{C}-\text{C}-\text{H}\\ \ \ \ \ \ \ \ \ \ | \ \ \ \ \ \ \ \ \ \ \ \ \ \ |\ \ \ \ \ \ \ | \\ \ \ \ \ \ \ \ \ \text{H}\ \ \ \ \ \ \ \ \ \ \ \ \text{H}\ \ \ \ \ \text{H}$