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It is a compound...
Ya it is the second hardest substance
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which is the hardest??
it is supposed to be diamond.. but there may be some new synthetically prepared substance
Wurtiz Boron(w-BN) is more harder than diamond and Lonsdaleite is even harder material than w-BN!!
No boron carbide is not the hardest element . It comes on number third in hardness. Diamond ( a non metal ) is the hardest material.
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