1.2.5 Group 1

• What are the elements in Group 1 known as?

  Alkali metals.
• How many electrons do Group 1 elements have in their outer shell?

  1.
• Water’s reaction with Group 1 elements

  Vigorous reaction which produces hydrogen and a metal hydroxide.
• Oxygen’s reaction with Group 1 elements

  Lithium forms lithium oxide

  Sodium forms sodium oxide and sodium peroxide

  Potassium forms potassium peroxide and potassium superoxide
• Chlorine’s reaction with Group 1 elements

  Vigorous reaction which forms white metal chloride salts.
• Does reactivity increase or decrease down Group 1?

  Increase.