Periodic Trends

• The energy change from when an atom gains an electron to form a negative ion
• Can be Exothermic or Endothermic
  • Metals
    • Easier to lose than gain
    • Usually Endothermic, or slightly Exothermic
  • Nonmetals
    • Easier to gain electrons
      • Adding electrons is Exothermic, affinity is negative because it releases energy