- Covalent bonds are poor conductors and generally non-conductive; thus, A is 'No' and E is 'Yes'.
- Ionic bonds are generally non-conductive in solid form and are brittle (not malleable); thus, B is 'No' and D is 'No'.
- Metallic bonds are highly conductive and malleable; thus, C is 'Yes'.
- Final mappings: A: No, B: No, C: Yes, D: No, E: Yes.
Explanation
- Analysis of Bond Properties
We are asked to identify the characteristics of three types of chemical bonds: covalent, metallic, and ionic, based on their conductivity, malleability, and non-conductivity, as presented in the given table.
- Covalent bonds: These are formed by the sharing of electrons. In general, covalent compounds are poor conductors of electricity and are non-conductive. They are also typically brittle or soft, not malleable.
- Metallic bonds: These are formed by a sea of delocalized electrons. They are excellent conductors of electricity and heat, and they are famously malleable and ductile.
- Ionic bonds: These are formed by the electrostatic attraction between oppositely charged ions. Solid ionic compounds are generally non-conductive, but they conduct electricity when molten or dissolved in water. They are typically hard and brittle, not malleable.
- Mapping Properties to Table Cells
Now we examine the specific cells in the table:
- A: Conductivity of Covalent bonds. Covalent compounds do not conduct electricity. Therefore, A is "No".
- B: Conductivity of Ionic bonds. While ionic compounds conduct in solution, in a general classification table distinguishing them from metallic conductors, they are typically marked as "No" (when solid) or contrasted with the "Yes" of metals. Given the context of the table and the "No" for non-conductive, we determine B is "No".
- C: Malleability of Metallic bonds. Metals are known to be malleable. Therefore, C is "Yes".
- D: Malleability of Ionic bonds. Ionic compounds are crystalline and brittle, not malleable. Therefore, D is "No".
- E: Non-conductive property of Covalent bonds. Covalent compounds are non-conductive. Therefore, E is "Yes".
- Conclusion and Final Mapping
Based on our analysis, we can fill the table as follows:
- A = No
- B = No
- C = Yes
- D = No
- E = Yes
Thus, the identification of the placeholders is:
A: No, B: No, C: Yes, D: No, E: Yes.
Examples
Understanding the properties of chemical bonds is essential in materials science. For example, knowing that ionic solids are brittle and non-conductive but become conductive in solution explains why salt (an ionic compound) is used in batteries when dissolved in water, but remains a solid crystal structure that shatters when struck. This knowledge helps engineers choose the right materials for electrical components, structural designs, and chemical processes.