Module 2

• Isotopes?

  Atoms of the same element with different numbers of neutron and different masses
• Ion?

  is a charged ion the number of electrons is different to the number of protons
• Atomic number?


  The number of protons in an atom's nucleus.
• Bohr model ?

  describes an atom as a small dense nucleus with electrons orbiting around the nucleus. This model explains different periodic properties of atoms.
• Electron?

  negatively charged subatomic particle which orbits the nucleus at various energy levels. The relative mass of an electron is 1/1836.
• Ion?


  a charged atom or molecule
• Mass number?


  The total number of protons and neutrons in an atom's nucleus.
• Mass spectrometry?

  an instrument which gives accurate information about relative isotopic mass and the relative abundance of isotopes.
• relative abundance?


  the amount of one substance compared to another
• Relative atomic mass?


  The weighted mean mass of an atom compared with 1/12 the mass of an atom of carbon 12