Which of the following best explains why diamonds are very hard?
a. diamonds are made up of several different isotopes of carbon.
b. diamonds are made up of several different allotropes of carbon.
c. the atoms in a diamond are arranged in a rigid crystalline structure.
d. the atoms in a diamond are arranged in flat sheets that are tightly bonded.

Option (C)

Explanation: Diamond is the hardest element and it is because the carbon atoms are linked with one another by a strong covalent bond, forming an unbreakable crystalline structure. Covalent bonds are formed when atoms share electrons with each other.

According to the Mohr's hardness scale, diamond has hardness of 10, being the hardest of all. It is denoted by C and it crystallizes in the isometric system and its durability is very high.

Diamonds are found in the kimberlite pipes, where the kimberlite rocks are located at a great depth having extreme pressure condition.

Diamonds are often used in the jewelries.

Thus, the correct answer is option (C).

passed in september 1935, these laws are known as nuremberg laws.   they forbid jews from marrying but not directly forced them to divorce aryans. what is most noticeable is the fact that the jews were defranchised, meaning by this that they were not expected to have any civil rights, including the right to vote. the right answer is deprived of the right to vote.