periodic trends

• the properties of the elements change in a predictable way. What is this called?

  Periodic trends
• What is the periodic trend in alkali metals?

  Increasing reactivity, MP & BP decrease , size of atom increase
• What are the periodic trends in halogens?

  Decreasing in atomic size, increasing MP & BP, and increasing reactivity.
• What is the periodic trend in noble gases?

  stable and non reactive