GroupsOfElements

• A vertical column in the periodic table is called a group or family
  • Elements in a group all have similar chemical and physical properties
  • The elements in a group have the same number of electrons in their outer shell.
  • Going from top to bottom,each element has one more occupied energy level
• Group I elements (except hydrogen) are called alkali metals
• Group II elements are called alkaline earth metals
  • Group I & II elements very reactive, since they readily lose electrons

1-Alkali metals 2-Alkaline earth metals 18-Noble gases 17-Halogens