Metallic structure and properties | Exit Quiz | Oak National Academy

Match the following terms to the correct definition.

• ductile

• Substance that allows charge or energy to flow through it.

• malleable

• Can be drawn into a wire.

• conductor

• Describes electrons free to move through the structure.

• delocalised

• Can be hammered or pressed into shape without breaking.

Answer explanation

Metals are good conductors of electricity and energy as they have delocalised electrons.

Tags

NGSS.HS-PS2-5

A metallic bond is the strong electrostatic force of attraction between the (a)   and the delocalised electrons.

Answer explanation

A metallic bond is the strong electrostatic force of attraction between the positively charged metal ions and the negatively charged delocalised electrons.

Which of the following statements describe the structure of a metal?

• Regular structure of positive ions.

• A sea of delocalised electrons.

• More negative than positive charges.

• Negative metal ions.

Answer explanation

When an atom loses electrons it becomes a positively charged ion. Metal ions are positively charged. In a giant metallic structure these electrons become delocalised.

Mercury is a metal that is liquid at room temperature. What does this tell you about the properties of mercury?

• It is ductile.

• It has a low melting point.

• It is malleable.

• It conducts electricity.

Answer explanation

Mercury has a low melting point of -39 °C, this means it is liquid at room temperature, 20 °C.

True or false? The individual atoms of a metal have the same physical properties of the whole metal.

• true

• false

Answer explanation

Individual atoms do not have the physical properties of the substances that contain them.

Metals are good thermal conductors because ...

• they contain delocalised electrons.

• they contain metal ions.

• they are good electrical conductors.

Answer explanation

When these delocalised electrons collide in metals, they transfer energy faster than in insulators.