Metallic bonding

More than 75% of the elements in the periodic table are metalsMetals are extremely useful materials with a wide variety of uses. This is due to the fact that they have a range of useful physical properties.

all metals are :

  • good conductors of heat and electricity​

most metals are:

  • shiny when freshly cut
  • high melting point solids
  • ductile and malleable

many metals are:

  • strong
  • sonorous 

​Assumed background knowledge:

 1.52C Activity 1. Representing metals

A metallic lattice: Positive ions are arranged in layers. Electrons are free to move ( delocalised)

 Students should:

  • 1.52C know how to represent a metallic lattice by a 2-D diagram

You will have seen in earlier topics how metals tend to form positively charged ions. This happens when the metal atoms lose electrons. In metal atoms the outer shell of electrons is not held strongly to the atom. This means the outermost electrons can move freely throughout the structure.

Since electrons are negatively charged ( and occupying the spaces between the positive ions)  the attraction that exists between these opposite charges results in strong bonding within the lattice.

​a two dimensional model of a metallic lattice
a raft of tiny bubbles is also a two dimensional model but is more realistic

1.53 - 1.54. Activity 2. Metallic bonding

 Students should:

  • 1.53C understand metallic bonding in terms of electrostatic attractions
  1. ​Why are saucepans made of metal
  2. Why is the core of electrical cables made of metal?
  3. What property of metals makes it possible to make them into different shapes?
  4. What does the term ductile mean?
  5. How are metal ions arranged in a metal structure
  6. Why do most metals have high melting points?
  7. What is metallic bonding?

 1.54 Activity 3. Metallic properties

 Students should:

  • 1.54C explain typical physical properties of metals, including electrical conductivity and malleability
  1. What can you say about the number of electrons in the outermost shells of metal atoms
  2. How does this explain the conductivity of metals
  3. What can you say about the density of most metals?  
  4. Why is is difficult to vapourise most metals?
  5. Why are most metals shiny?
  6. Why do metals make a ringing sound when struck?

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