group 1

• What is the reactivity trend of alkali metals down the group?

  Reactivity increases down the group
• Why does reactivity increase down the alkali metals group?

  Due to increased size and decreased nuclear charge
• What type of ions do alkali metals form?

  +1 ions
• Why are alkali metals stored in kerosene or oil?

  To prevent reactions with air and water
• What is the appearance of alkali metals when freshly cut?

  Soft, silvery, and shiny
• Why do alkali metals look dull in air?

  They react with oxygen to form oxides
• Which alkali metal is less reactive, lithium or francium?


  Lithium
• Group 1: Alkali Metals Chemical Properties

  REACTION WITH WATER

  Reacts with water to metal hydroxide

  Metal hydroxide are alkali therefore the pH increases. Reactivity increases down the group so potassium reacts violently

  Fizzing is produced due to the formation of hydrogen.
• What is the trend in melting and boiling points of alkali metals down the group?

  Melting and boiling points decrease down the group
• What happens to the melting and boiling points of alkali metals as you move down the group?

  They decrease
• Reaction with Oxygen

  Reacts with oxygen to form a metal oxide

  Metals go dull in air due to this reaction
• Reaction with Halogens

  React with halogens to form metal Halides

  Metal Halides are while solids but dissolve in water to form colourless solutions.
• The Reactivity of Group 1 increases down the group as the tendency to loose an electron increases down the group. – React by loosing an electron