Elements, Isotopes & Relative Atomic Mass

• In an element all of the atoms are the same
• There are around 100 different elements
• Isotopes are different forms of the same element, that have the same number of protons, but a different number of nuetrons.
• For example the isotopes of carbon, carbon 12 and carbon 13, will chemically react the same way, but have different masses.
• Relative Atomic Mass

  Average mass of all the isotopes that make up an element
• Relative Atomic Mass equation

  (isotope abundance x isotope mass) / abundances of all isotopes
• Label the diagram

  A) 69.2

  B) 63

  C) 30.8

  D) 65

  E) 69.2

  F) 30.8

  G) 63.6169