Group 1

• Properties of group 1 metals

  Soft

  Low density

  Very reactive

  Weak

  Low melting points
• Trends seen in group 1 as you go down the table

  Increased reactivity

  Lower melting and boiling points

  Higher atomic mass
• Reaction between group 1 elements and water

  Metal + Water —> Metal Hydroxide + Hydrogen
• Reaction between group 1 element and chlorine

  Metal + Chlorine —> Metal Chlorine
• Reaction between a group 1 element and oxygen

  Metal + Oxygen —> Metal oxide
• Why do group 1 metals become more reactive

  Atomic radius and shielding increase

  Means there is a weaker electrostatic attraction between outer most electrons and the nucleus

  This means that the amount of energy required to lost the outer most electron decreases