metallic bonding

metallic bonds and the properties of metals

The valence electrons surrounding metal ions are constantly moving. This makes metals good conductors of electricity. The lattice-like structure of metal ions is strong but quite flexible. This allows metals to bend without breaking. Metals are both ductile (can be shaped into wires) and malleable (can be shaped into thin sheets). Q: Look at the metalworker in the Figure 1.2. Hes hammering a piece of hot iron in order to shape it. Why doesnt the iron crack when he hits it? A: The iron ions can move within the sea of electrons around them. They can shift a little closer together or farther apart without breaking the metallic bonds between them. Therefore, the metal can bend rather than crack when the hammer hits it.

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what are metallic bonds

Metallic bonds are forces of attraction between positive metal ions and the valence electrons that are constantly moving around them (see the Figure 1.1). The valence electrons include their own and those of other, nearby ions of the same metal. The valence electrons of metals move freely in this way because metals have relatively low electronegativity, or attraction to electrons. The positive metal ions form a lattice-like structure held together by all the metallic bonds. Click image to the left or use the URL below. URL: Q: Why do metallic bonds form only in elements that are metals? Why dont similar bonds form in elements that are nonmetals? A: Metal atoms readily give up valence electrons and become positive ions whenever they form bonds. When nonmetals bond together, the atoms share valence electrons and do not become ions. For example, when oxygen atoms bond together they form oxygen molecules in which two oxygen atoms share two pairs of valence electrons equally, so neither atom becomes charged.

instructional diagrams

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questions

the lattice-like structure of a metal consists of negative metal ions in a sea of electrons.

a. true

-->  b. false

properties of metals that are possible because of their freely moving electrons include the ability to

a) conduct electricity.

b) bend without breaking.

c) form hydrogen bonds.

-->  d) two of the above

a metallic bond forms when one metal atom shares a pair of electrons with another metal atom.

a. true

-->  b. false

metallic bonds form only between atoms of two or more different metals.

a. true

-->  b. false

in the lattice-like structure of a metal

a) metal ions can move freely.

b) valence electrons are in fixed positions.

c) pairs of ions and electrons can move freely.

-->  d) none of the above

which of the following elements form(s) metallic bonds?

-->  a) iron

b) oxygen

c) carbon

d) two of the above

diagram questions

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