Periodic table

Periodic table

1. Group 1: alkaline metals

   • Very reactve
   • More reactive down the group as the electron is further from the nucleus
   • 1 electron in the outer shell
   • soft metals
   • Low density

2. Group 7: Halogens

   • Less reactive as you go down because the outer shell is further away from the nucleus
   • Very reactive
   • Colored vapors
   • Further down, higher melting points

3. Group 0: noble gasses

   • Inert
   • outer shell always has 8 electrons
   • Further down, higher melting points

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