Question

4. A crystalline solid is brittle, has a high melting point, and has low electrical conductivity. Which of the following describes the type of bonds within it?

A. ionic bonds between metals and nonmetals

B. covalent bonds between molecules

C. metallic bonds between atoms

D. covalent bonds between ions

5. On the basis of structure, which of the following solids is the most brittle?


A. CaF2

B. C6H12O6

C. Cu

D. Au

Answer 1

#4 A. ionic bonds between metals and nonmetals
#5 A. CaF2

Answer 2

A crystalline solid is brittle, has a high melting point, and has low electrical conductivity is ionic bonds between metals and nonmetals.
On the basis of structure, ca F2 is the most brittle
hope this helps