metals and alloys

• What happens when a metal atom reacts with a non-metal atom?

  Ionic bonding occurs
• What type of bonding occurs between two non-metal atoms?

  Covalent bonding
• How are atoms arranged in metals?

  In giant structures with regular layers
• What are delocalized electrons in metals?

  Electrons free to move through the structure
• How many protons do lithium atoms have?

  Three protons
• What happens to the outer electrons in metal atoms?

  They become delocalized and move freely
• What do we call the positive metal ions in metals?

  Positive metal ions
• What is the nature of the attraction between delocalized electrons and metal ions?

  Strong electrostatic attraction
• What is the term for the attraction in metallic bonding?

  Metallic bond
• Why do metals have high melting and boiling points?

  Strong metallic bonds require much energy to break
• Why are metals excellent conductors of heat and electricity?

  Delocalized electrons can move freely
• How do moving electrons contribute to heat conduction in metals?

  They carry thermal energy
• What property allows metals to be bent and shaped?

  Layers of atoms can slide over each other
• Why are some pure metals not hard enough for practical use?

  They lack sufficient hardness
• What is an alloy?

  A mixture of metals
• How do different sizes of atoms in an alloy affect its properties?

  They distort layers, making alloys harder
• Why are alloys harder than pure metals?

  Different atom sizes hinder layer movement