Diamond is a very hard structure because
A) the network of covalent bonds extends in all directions.
B) it has a sea of electrons, which make it extremely durable.
C) it has layers of carbon that slide easily over each other.
D) it forms ionic bonds between each of the carbon atoms, and these bonds are difficult to break.
E) it takes millions of years to break down.
Correct Answer:
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A)Sr
B)C
C)F
D)Na
E)Ge
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