topic two chemistry

• relative isotopic mass is the mass of an isotope relative to 1/12 of a carbon 12 atom
• why can you not calculate the mass of atoms by adding together the mass of protons, neutrons and electrons?

  a fraction of their mass is lost to the strong nuclear forces holding the protons and neutrons together
• relative atomic mass


  the weighted mean mass of an atom relative to 1/12 of a carbon 12 atom
• Ar= isomer x percentage abundance/ 100
• binary compounds


  compounds containing 2 elements