Metallic Bonding

Metal ions always have a (a)   charge.

Electrons have a (a)   charge.

In a metallic bond the electrons are free to move around. They are called...

• disappeared electrons

• delocalised electrons

• dissipated electrons

• diverted electrons

There are strong electrostatic forces between the electrons and the metal ions in a metallic bond.

• True

• False

Select the correct properties of metals.

• Malleable

• Most are solid at room temperature

• Bad conductors of heat

• Good conductors of electricity

Why are most metals solid at room temperature?

• The charges on the electrons and the metal ions cancel each other out.

• The delocalised electrons help to transfer heat.

• It requires a lot of energy to overcome the electrostatic forces of attraction.

• It requires little energy to overcome the electrostatic forces of attraction.

Which part of a metallic bond helps to transfer heat and electricity more efficiently?

(a)  

What does malleable mean?

• They make a sound when hit.

• They can be bent into different shapes without breaking.

• They are good conductors.

• They melt at very high temperatures.

What is the name of a substance that is a mixture of two or more metals, or a metal and another element?

(a)  

Alloys are harder than pure metals. Why is this?

• In alloys, different sized atoms distort the rows meaning they cannot slide over each other easily.

• A mixture of atoms means that there is a ranged melting point.

• Alloys have fewer delocalised electrons than pure metals.

• The charges of the electrons and the ions in an alloy cancel each other out.