Chemistry

Chemistry

1. Mendeleev

   • grouped together elements with similar properties
   • put elements in order of reletive atomic mass
   • left gaps for unknown elements and predicted their properties

2. Atomic structure and isotops

   • proton
     • charge = +1
       • mass = 1
   • neutron
     • charge = 0
       • mass= 1
   • electron
     • charge = -1
     • mass = 0
   • relative atomic mass
     • the mean mass of an atom to the mass of carbon
   • Isotopes
     • Atoms of an element with the same number of protons and electrons but with a different sumber of neutrons
     • example
       • (relative