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: [[Chlorine]] has the [[Chemical Formula|chemical formula]] [[Chlorine|Cl<sub>2</sub>]].
: There are two [[Stable Isotope|stable isotopes]] of [[Chlorine]], one with 18 [[neutron]]s and the other with 20 [[neutron]]s. They occur in a [[ratio]] of roughly 3:1 so the [[Relative Atomic Mass|atomic mass]] of [[Chlorine]] is 35.5.
====Calculating the Average Relative Atomic Mass====
{| class="wikitable"
| style="height:20px; width:600px; text-align:center;" |[[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. Find the [[Mean Average|average]] [[Relative Atomic Mass|atomic mass]] of [[Chlorine]].
|-
| style="height:20px; width:600px; text-align:left;" |'''1. State the known quantities.'''
Ratio: 3:1
3xChlorine-35 : 1xChlorine-37
|-
| style="height:20px; width:600px; text-align:left;" |'''2. [[Substitute (Maths)|Substitute]] the numbers into the [[equation]] and [[Solve (Maths)|solve]].'''
To find the [[Mean Average|average]]:
<math>Average=\frac{35+35+35+37}{4}</math>
<math>Average=\frac{35 \times 3 + 37 \times 1}{4}</math>
<math>Average=35.5</math>
So the [[Relative Atomic Mass]] of [[Chlorine]] is quoted as 35.5 on the [[Periodic Table]].
|}
: [[Chlorine]] is the most [[Reactivity|reactive]] [[Halogen]].
: [[Chlorine]] [[Chemical Reaction|reacts]] strongly with [[Hydrogen]] to produce [[Hydrogen Chloride]] which [[dissolve]]s in [[water]] to produce [[Hydrochloric Acid]].