Understanding Metallic Solids and Alloys

What is the primary reason for the high electrical conductivity in metals?

• Hexagonal closest packed structure

• Delocalized valence electrons

• Non-directional covalent bonding

• Presence of metal cations

Which packing arrangement is also known as the hexagonal closest packed structure?

• ABC Arrangement

• ABA Arrangement

• Body centered cubic

• Face centered cubic

How do substitutional alloys differ from interstitial alloys?

• Interstitial alloys have larger impurity atoms fitting into gaps.

• Interstitial alloys have atoms of similar size replacing host atoms.

• Substitutional alloys have atoms of similar size replacing host atoms.

• Substitutional alloys have smaller impurity atoms fitting into gaps.

What effect does carbon have when added to iron to form steel?

• Increases malleability

• Decreases resistance to compression

• Increases electrical conductivity

• Decreases malleability

Which element, when added to steel, improves its resistance to corrosion?

• Chromium

• Cobalt

• Manganese

• Nickel