Changes

: 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]] then different [[isotope]]s are not included. Instead : On the [[Periodic Table]] an [[average]] [[Relative Atomic Mass|atomic mass]] is given based on the [[Relative Atomic Mass|mass]] of each [[isotope]] and how common it is.[[Chlorine]] has two common [[Stable Isotope|stable]] [[Isotope]]s; [[Chlorine-35]] and [[Chlorine-37]]. [[Chlorine-35]] is three times more common than [[Chlorine-37]] so the ratio is 3:1. To find the [[Mean Average|average]] [[Relative Atomic Mass|atomic mass]] the [[Relative Atomic Mass|mass]] of each [[isotope]] is considered along with the [[ratio]] of abundance. Ratio: 3:1 3xChlorine-35 : 1xChlorine 37 To find the [[Mean Average|average]]:<math>Average=\tfrac{35+35+35+37}{4}</math><math>Average=\tfrac{35 \times 3 + 37}{4}</math>