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==Key Stage 2==
===Meaning===
[[Hydrogen]] is a [[gas]] that can catch fire easily.
==Key Stage 3==
===Meaning===
[[Hydrogen]] is a [[non-metal]] [[element]] with 1 [[proton]] in the [[Atomic Nucleus|nucleus]].
===About Hydrogen===
: [[Hydrogen]] has the [[Chemical Formula|chemical formula]] [[Hydrogen|H<sub>2</sub>]].
: [[Hydrogen]] is a [[gas]] at [[STP|room temperature]].
: [[Hydrogen]] [[gas]] is less [[density|dense]] than [[air]].
===Testing for Hydrogen===
#Collect the [[gas]] in a [[Test Tube|test tube]].
#Place a lit [[Wooden Splint|splint]] over the mouth of the [[Test Tube|test tube]].
#If a 'squeaky pop' [[sound]] is made then the [[gas]] is [[Hydrogen]].
==Key Stage 4==
===Meaning===
[[Hydrogen]] ('''is a [[non-metal]] [[element]] with 1 [[proton]] in the [[Atomic Nucleus|nucleus]].===About Hydrogen===: [[Hydrogen]] has the [[Chemical Formula|chemical formula]] [[Hydrogen|H<sub>2</sub>''') ]].: [[Hydrogen]] is a [[gas]]eous (at [[Standard Temperature STP|standard temperature and Pressurepressure]].: [[Hydrogen]] [[gas]] is less [[density|STPdense]] than [[air]].===Isotopes===: [[Hydrogen]]) has three common [[isotope]]s;:*[non-metal[Hydrogen]] – A [[elementStable Isotope|stable isotope]] with 1 no [[neutron]]s.:*[[protonDeuterium]] in its – A [[Atomic NucleusStable Isotope|nucleusstable isotope]] with one [[neutron]].:*[[Tritium]] – An [[Unstable Isotope|unstable isotope]] with two [[neutron]]s.
===Testing for Hydrogen===
#Collect the [[gas]] in a [[Test Tube|test tube]].
#Place a lit [[Wooden Splint|splint]] over the mouth of the [[Test Tube|test tube]].
#If a 'squeaky pop' [[sound]] is made then the [[gas]] is [[Hydrogen]].