Sodium is a metal found in Group 1 of the Periodic Table.
Describe the structure and bonding in a metal. You may think about drawing a diagram to support your description.
Sodium is malleable even though metallic bonds are strong. Explain why metals are malleable.
Sodium can conduct electricity in the solid and liquid state. Explain why metals can conduct electricity.
An alloy is a mixture of a metal with one or more other elements. When aluminium is mixed with magnesium, it forms an alloy called magnalium, which is used in aerospace structures. Adding different amounts of magnesium to the aluminium changes the properties of the alloy.
| Alloy | Percentage of magnesium (%) | Density (g/cm3\text{g/cm}^3g/cm3) | Melting point (∘C^\circ\text{C}∘C) | Strength (MPa\text{MPa}MPa) |
|---|---|---|---|---|
| D | 4.00 | 2.66 | 620 | 230 |
| E | 6.00 | 2.63 | 610 | 270 |
| F | 8.00 | 2.61 | 590 | 250 |
A scientist thinks that alloy E is the best of these three for making a high-strength, lightweight structural component. Is she correct? Explain your answer using evidence from the table.
The scientist uses the particle model to show the elements present in alloy E. Look at her diagram.
Calculate the percentage of magnesium atoms in the diagram of alloy E.
Use your answer to part (c)(i) to explain if the diagram accurately shows the structure of alloy E.