Periodic table

Periodic table

1. Groups and periods

   • Definitions
     • Periods
       • The rows of the periodic table
     • Groups
       • The columns of the periodic table
   • Patterns
     • atomic number
       • goes up by 1 left to right
     • elements in column have similar properties
     • blocks
       • metals in middle
       • gases far right
       • semi metals on left
       • non metals on right

2. Metals and non metals

   • Predicting properties
     • use position to predict
       • elements in a column have similar properties
       • elements in blocks have similar properties
       • position depends on atomic number
   • Properties
     • non metals
       • insulator of heat and electricity
       • low density
       • dull
       • brittle
       • not sonorous
     • Metal
       • conducts heat and electricity
       • shiny
       • sonorous
         • makes a ringing noise
       • mallable
       • ductile
       • high density

3. Group 1 elements

   • Properties
     • semi metals (alkali)
     • light (low density)
     • float(some)
     • shiny, soft
   • Reactivity
     • very reactive
       • hydrogen burns
       • alkali metals react violently with water
   • equations for reactions with water
     • metal(sodium...)+water=hydrogen+metal hydroxide

4. group 0 elements

   • physical properties
     • gases
   • chemical properties
     • inert, do not like to react
   • reactivity
     • very unreactive (inert)
       • due to atomic structure
   • compare group 0 and group 7
     • group 7 much more reactive
       • do not have enough electrons
     • group 7 contains gases as well

5. group 7 elements

   • properties
     • reactive
       • especially with group 1
         • forms salt like NaCl
     • most are gases
     • often used as disinfectants
   • displacement reactions
     • more reactive halogen displaces (removes) less reactive one from compound
       • prettier girl gets the boy
   • equations for displacements reactions
     • sodium bromide + chlorine = sodium chloride+bromine
   • called halogens