Introduction
Quick practice
Question 1 of 5
Diamond is the hardest known natural substance. Which of the following features are responsible for this extreme hardness?
A
It contains free electrons that move throughout the crystal.
B
It is held together by weak forces between independent molecules.
C
The carbon atoms are arranged in flat layers that slide over each other.
D
Each carbon atom is bonded to four other carbon atoms in a rigid, 3-dimensional tetrahedral structure.
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