4. Metallic Bonding

Question 1

What are the features of metallic bonding?

Answer 1

Positive metal ions;
as outer shell electrons lost;
in a giant lattice structure;
with a sea of delocalised electrons

Question 2

How does bonding work in metallic bonding?

Answer 2

Positive metal ions;
attract the sea of negative electrons;
due to electrostatic attraction;
therefore metal ions bonded/attract indirectly

Question 3

What are the electrical conductivity properties of metallic bonding and why?

Answer 3

Good conductor as solid and liquid;

Electrons are free to move through the lattice

Question 4

What are the thermal properties of metallic bonding?

Answer 4

Metals have high melting and boiling points;

Metals are good conductors of heat.

Question 5

Why do metals (often) have high melting and boiling points?

Answer 5

The forces of electrostatic attraction between the positive metal ions and the sea of negative electrons are strong;
Lots of energy required to break the bonds.

Question 6

What is a mixture of metals or metals and carbon called?

Answer 6

An alloy

Question 7

What type of bonding is there in alloys?

Answer 7

Metallic

Question 8

Why are alloys harder than pure metals?

Answer 8

Atoms in the lattice have different sizes;
leading to the discontinuities/irregularities in the lattice structure;
so more difficult/energy required for the atoms in the lattice to move (around each other);
More force required to move the atoms into a new shape

Question 9

What are the general properties of metallic bonding?

Answer 9

high melting and boiling points;
good conductors of heat;
good conductor as solid and liquid;
malleable (under compression);
ductile (under tension);

Question 10

What are the properties of alloys compared to pure metals?

Answer 10

Harder
Less malleble/ductile
Stiffer/harder to bend