Alkali metals

• Alkaline metals hydroxide when they react with water creating an alkaline solution what properties do they have?


  Low density

  soft can be cut with a knife

  very reactive
• Alkali metals and metals also share some general properties such as


  Good conductors of heat and electricity

  shiny
• Drawing a chemical reaction that alkaline metals lose their one outer electron and become a positive iron
• Must have a electrons in the atom shell which makes them very unreactive
• As you go down the group one that atoms get larger and under the outer electrons are more shielded from the nucleus
• The shielding makes the outer electrons less attractive to to the nucleus
• This makes it easier to lose the auto electrons
• Alkali metals got more reactive as you go down the group
• Describe the trend in the physical properties of the halogens as you go down the group what happens to the following?

  Relative size increases

  melting and boiling points increases

  states at room temperature goes from a gas to a solid

  colour gets darker

  Reactivity
• The iron wool experiment and all experiments done with halogens are done in a fume cupboard as halogens are toxic elements
• in group 7 the further down the group an element is the higher its relative molecular mass melting point and boiling point. it becomes less reactive
• Displacement reaction occurs when a more reactive element from its compound