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[[Chlorine]] is a [[Group 7]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 17.
===About Chlorine===
====Molecular Structure====
: [[Chlorine]] has the [[Chemical Formula|chemical formula]] [[Chlorine| Cl<sub>2</sub>]].
====Atomic Structure====
: [[Chlorine]] as 17 [[proton]]s and 18 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Atomic Number]] of 17 and an [[Relative Atomic Mass|atomic mass]] of 35.
: An [[atom]] of [[Chlorine]] is missing one [[electron]] from having a full [[Outer Shell|outer shell]].
: '''Chloride''' [[ion]]s gain 1 [[electron]] to get a full [[Outer Shell|outer shell]] and become [[Negative Charged|negatively charged]].
====Properties====
: [[Chlorine]] is a more [[Reactivity|reactive]] [[Halogen]] than [[Bromine]] but less [[Reactivity|reactive]] than [[Fluorine]].
: [[Chlorine]] [[Chemical Reaction|reacts]] strongly with [[Hydrogen]] to produce [[Hydrogen Chloride]] which [[dissolve]]s in [[water]] to produce [[Hydrochloric Acid]].
: [[Chlorine]] kills [[bacteria]].
: [[Chlorine]] is a pale green coloured [[gas]] at [[STP|room temperature]].
==Key Stage 4==
[[Chlorine]] is a [[Group 2]] [[element]], on the [[Periodic Table]], with 17 [[proton]]s in the [[Atomic Nucleus|nucleus]].
===About Chlorine===
====Molecular Structure====
: [[Chlorine]] has the [[Chemical Formula|chemical formula]] [[Chlorine|Cl<sub>2</sub>]].
====Atomic Structure====
: 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.
{| 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]].
So the [[Relative Atomic Mass]] of [[Chlorine]] is quoted as 35.5 on the [[Periodic Table]].
|}
: An [[atom]] of [[Chlorine]] is missing one [[electron]] from having a full [[Outer Shell|outer shell]].: '''Chloride''' [[ion]]s gain 1 [[electron]] to get a full [[Outer Shell|outer shell]] and become [[Negative Charged|negatively charged]].====Properties====
: [[Chlorine]] is a more [[Reactivity|reactive]] [[Halogen]] than [[Bromine]] but less [[Reactivity|reactive]] than [[Fluorine]].
: [[Chlorine]] [[Chemical Reaction|reacts]] strongly with [[Hydrogen]] to produce [[Hydrogen Chloride]] which [[dissolve]]s in [[water]] to produce [[Hydrochloric Acid]].
: [[Chlorine]] kills [[bacteria]].
: [[Chlorine]] is a pale green coloured [[gas]] at [[STP|standard temperature and pressure]].
====Testing For Chlorine====
#Collect the [[gas]] in a [[Test Tube|test tube]].
#Place a piece of [[Litmus Paper|litmus paper]] over the mouth of the [[Test Tube|test tube]].
#If the [[Litmus Paper|litmus paper]] is [[bleach]]ed white then the [[gas]] is [[Chlorine]] or [[Fluorine]].