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: Each [[element]] has many [[isotope]]s but some are [[Stable Isotope|stable]] and others are [[Unstable Isotope|unstable]] so they [[Radioactive Decay|decay]] quickly into other [[isotope]]s or a different [[element]].
: Different [[isotope]]s of the same [[element]] have the same [[Atomic Number|atomic number]] but different [[Relative Atomic Mass|atomic mass]] due to the different numbers of [[neutron]]s.
: Different [[isotope]]s of the same [[element]] have the same [[Chemical Property|chemical properties]] but they have different [[Physical Property|physical properties]]. This means they cannot be separated by chemical processes but they can be separated by physical ones.
: Different [[isotope]]s of the same [[element]] may have different [[Boiling Point|boiling points]], different [[Melting Point|melting point]]s, may [[Diffusion|diffuse]] at different rates and, as has already been stated, have a different [[Relative Atomic Mass|mass]]. This means [[isotope]]s can be separated by processes such as [[Distillation]], [[Chromatography]] and [[Centrifuge]].
===Examples===
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===Calculating Atomic MassIsotopic Abundance===: Different [[isotope]]s of the same [[element]] do not all appear in the same quantities. Some [[isotope]]s are more common than others.: The [[Periodic Table]] orders the [[element]]s due to their [[Chemical Property|chemical properties]] but since [[isotope]]s of the same [[element]] have the same [[Chemical Property|chemical properties]] different [[isotope]]s are not included. Instead an [[average]] [[Relative Atomic Mass|atomic mass]] is given based on the [[Relative Atomic Mass|mass]] of each [[isotope]] and how common it is.