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==Key Stage 3==
===Meaning===
[[File:HydrogenSymbol.png|right|300px|thumb|The [[Chemical Symbol|chemical symbol]] for [[hydrogen]].]]
[[Hydrogen]] is a [[non-metal]] [[element]] with 1 [[proton]] in the [[Atomic Nucleus|nucleus]].
===About Hydrogen===
: [[Hydrogen]] is a [[gas]] at [[STP|room temperature]].
: [[Hydrogen]] [[gas]] is less [[density|dense]] than [[air]].
: An [[atom]] of [[hydrogen]] has one [[electron]].
: A [[Hydrogen]] [[ion]] has usually lost its only [[electron]] to become [[Positive Charge|positively charged]].
===Testing for Hydrogen===
#Collect the [[gas]] in a [[Test Tube|test tube]].
: [[Hydrogen]] is a [[gas]] at [[STP|standard temperature and pressure]].
: [[Hydrogen]] [[gas]] is less [[density|dense]] than [[air]].
: An [[atom]] of [[hydrogen]] has one [[electron]].
: A [[Hydrogen]] [[ion]] has usually lost its only [[electron]] to become [[Positive Charge|positively charged]].
===Isotopes===
{| class="wikitable"| style="height:20px; width:200px; text-align: center;" |[[Hydrogen]] has three common | style="height:20px; width:200px; text-align:center;" |[[isotopeDeuterium]]s| style="height:20px; width:200px; text-align:center;" |[[Tritium]]|-|[[File:*Hydrogen.png|center|200px]]|[[File:Deuterium.png|center|200px]]|[[File:Tritium.png|center|200px]]|-|[[File:HydrogenSymbol.png|center|200px]]|[[File:DeuteriumSymbol.png|center|200px]]|[[File:TritiumSymbol.png|center|200px]]|-| style="height:20px; width:200px; text-align:center;" |[[Hydrogen]] – A always has 1 [[proton]] but [[Stable Isotope|stable isotope]] with there are no [[neutron]]s.| style="height:*20px; width:200px; text-align:center;" |[[Hydrogen]] always has 1 [[Deuteriumproton]] – A but in this [[Stable Isotope|stable isotope]] with one there is 1 [[neutron]]. This [[isotope]] of [[Hydrogen]] is known as [[Deuterium]].| style="height:20px; width:200px; text-align:*center;" |[[TritiumHydrogen]] always has 1 [[proton]] – An but in this [[Unstable Isotope|unstable isotope]] with two there is 2 [[neutron]]s.This [[isotope]] of [[Hydrogen]] is known as [[Tritium]].|}
===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]].