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==Key Stage 2=====Meaning===[[Fluorine]] is a yellow [[gas]].==Key Stage 3=====Meaning===[[File:FluorineSymbol.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[Fluorine]].]][[Fluorine]] is a [[Group 7]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 9.===About Fluorine===: [[Fluorine]] has the [[Chemical Formula|chemical formula]] [[Fluorine| F₂]].: [[Fluorine]] as 9 [[proton]]s and 10 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Atomic Number]] of 9 and an [[Relative Atomic Mass|atomic mass]] of 19.: [[Fluorine]] is the most [[Reactivity|reactive]] [[Halogen]].: [[Fluorine]] [[Chemical Reaction|reacts]] strongly with [[Hydrogen]] to produce [[Hydrogen Fluoride]] which [[dissolve]]s in [[water]] to produce [[Hydrofluoric Acid]].: [[Fluorine]] is a strong [[bleach]]ing agent.: [[Fluorine]] kills [[bacteria]].: [[Fluorine]] is a yellow coloured [[gas]]eous (at [[Room TemperatureSTP|room temperature]]) .: An [[atom]] of [[Fluorine]] is missing one [[electron]] from having a full [[Outer Shell|outer shell]].: [[Fluorine]] [[ion]]s gain 1 [[electron]] to get a full [[Outer Shell|outer shell]] and become [[Negative Charged|negatively charged]].==Key Stage 4=====Meaning===[[Fluorine]] is a [[Group 72]] [[non-metalelement]] , on the [[elementPeriodic Table]] , with 9 [[proton]]s in the [[Atomic Nucleus|nucleus]].===About Fluorine===: [[Fluorine]] has the [[Chemical Formula|chemical formula]] [[Fluorine|F₂]].: The most [[Stable Isotope|stable isotope]] of [[Fluorine]] has 10 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Relative Atomic Mass|atomic mass]] of 19.: [[Fluorine]] is the most [[Reactivity|reactive]] [[Halogen]].: [[Fluorine]] [[Chemical Reaction|reacts]] strongly with [[Hydrogen]] to produce [[Hydrogen Fluoride]] which [[dissolve]]s in [[water]] to produce [[Hydrofluoric Acid]].: [[Fluorine]] is a strong [[bleach]]ing agent.: [[Fluorine]] kills [[bacteria]].: [[Fluorine]] is a yellow coloured [[gas]] at [[STP|standard temperature and pressure]].: An [[atom]] of [[Fluorine]] has only 2 [[electron]]s in its [[Outer Shell|outer shell]].: [[Fluorine]] [[ion]]s gain 1 [[electron]] to get a full [[Outer Shell|outer shell]] and become [[Negative Charged|negatively charged]].====Testing For Fluorine====#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 [[Fluorine]] or [[Chlorine]].