Diamond is hard because
Correct answer: C. It is a giant covalent structure
- A. It has a high value of refractive index
- B. All the valence electrons of each carbon atom are involved in bonding
- C. It is a giant covalent structure
- D. It is a crystalline allotrope of carbon
Explanation
Diamond is a form of carbon with a giant covalent structure, where each carbon atom forms four strong covalent bonds, creating a rigid, three-dimensional network that results in exceptional hardness. Option C is correct as it emphasizes the importance of the giant covalent structure. Option A is incorrect because the refractive index relates to optical properties, not hardness. Option B, although true for diamond, does not directly explain its hardness. Option D only describes diamond's allotropy and crystalline nature, which do not fully explain its hardness.
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About s-Block and p-Block Elements
The s and p blocks are studied through their valence-shell configurations, periodic trends and characteristic chemical properties. Work covers the reactions of Group I and Group II elements, the behaviour of Group IV elements, and how atomic size, ionization energy, electronegativity and metallic character change across periods and down groups.
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