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==Key Stage 2==
===Meaning===
[[Chlorine]] is a pale green [[gas]].
==Key Stage 3==
===Meaning===
[[File:ChlorineSymbol.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Chlorine]].]]
[[Chlorine]] is a [[Group 7]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 17.
===About Chlorine===
: [[Chlorine]] has the [[Chemical Formula|chemical formula]] [[Chlorine| Cl<sub>2</sub>]].
: [[Chlorine]] as 17 [[proton]]s and 18 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Atomic Number]] of 17and an [[Relative Atomic Mass|atomic mass]] of 35.
: [[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]] is a strong [[bleach]]ing agent.
: [[Chlorine]] kills [[bacteria]].
: [[Chlorine]] is a pale green coloured [[gas]] at [[STP|room temperature]].
: An [[atom]] of [[Chlorine]] is missing one [[electron]] from having a full [[Outer Shell|outer shell]].
: [[Chlorine]] [[ion]]s gain 1 [[electron]] to get a full [[Outer Shell|outer shell]] and become [[Negative Charged|negatively charged]].
==Key Stage 4==
===Meaning===
[[Chlorine]] ('''is a [[Group 2]] [[element]], on the [[Periodic Table]], with 17 [[proton]]s in the [[Atomic Nucleus|nucleus]].===About Chlorine===: [[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.: [[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]].: [[Chlorine]] is a strong [[bleach]]ing agent.: [[Chlorine]] kills [[bacteria]].: [[Chlorine]] is a pale green coloured [[gas]]eous (at [[Room TemperatureSTP|room standard temperatureand pressure]]) .: An [[non-metalatom]] of [[elementChlorine]] with 17 has only 2 [[protonelectron]]s in its [[Atomic NucleusOuter Shell|nucleusouter shell]].: [[Chlorine]] [[ion]]s gain 1 [[electron]] to get a full [[Outer Shell|outer shell]] and become [[Negative Charged|negatively charged]].====Testing for 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]].