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→Key Stage 3
===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 17 and 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]].
: 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===