Groups in the periodic table

• Group 0

  • Have stable arrangements of electrons, causing them to be unreactive and don’t form molecules easily
  • Have 8 electrons on their outer shells, excluding helium that has 2 electrons
• Group 1

  • Known as the alkali metals
  • Contain 1 electron on the shell
  • The level of reactivity increases as you go down the group
  • Alkali metal + chlorine➡️ Metal Chloride
  • Alkali metal + water➡️ Metal hydroxide+ hydrogen
  • Alkali metal+oxygen➡️ Metal Oxide
• Group 7

  • Known as the halogens
  • Found in pairs of 2
  • The boiling points increase as you go down the elements
  • The relative molecular mass increases
  • The reactivity decreases
• • A more reactive halogen will displace a less reactive halogen
  • When it is in an aqueous solution of salt