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==Key Stage 2==
===Meaning===
[[Oxygen]] is a [[gas]] in the [[air]].
==Key Stage 3==
===Meaning===
[[Oxygen]] is a [[non-metal]] [[element]], on the [[Periodic Table]], with an [[Atomic Number|atomic number]] of 8.
===About Oxygen===
: [[Oxygen]] makes up 21% of the [[air]].
: [[Oxygen]] has the [[Chemical Symbol|chemical symbol]] [[Oxygen|O]].
====Molecular Structure====
: [[Oxygen]] has the [[Chemical Formula|chemical formula]] for a [[Oxygen]] [[molecule]] is [[Oxygen|O<sub>2</sub>]].
====Atomic Structure====
: [[Oxygen]] has 8 [[proton]]s and 8 [[neutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Atomic Number|atomic number]] of 8 and a [[Relative Atomic Mass|atomic mass]] of 16.
: [[Oxygen]] is in [[Period]] 2 of the [[Periodic Table]] because it has 2 [[Electron Orbital|electron shells]].
====Properties====
: [[Oxygen]] is a [[gas]] at [[STP|room temperature]].
==Key Stage 4==
===Meaning===
[[Oxygen]] ('''is a [[non-metal]] [[element]], on the [[Periodic Table]], with 8 [[proton]]s in the [[Atomic Nucleus|nucleus]]. ===About Nitrogen===: [[Oxygen]] makes up 21% of the [[air]].: [[Oxygen]] has the [[Chemical Symbol|chemical symbol]] [[Oxygen|O]].====Molecular Structure====: The [[Chemical Formula|chemical formula]] for an [[Oxygen]] [[molecule]] is [[Oxygen|O<sub>2</sub>''')is ]].: [[Oxygen]] forms a [[gasCovalent Bond|covalent bond]] with another [[Oxygen]] [[atom]]eous (at s to produce a [[Room TemperatureSimple Covalent Molecule|room temperaturesimple covalent molecule]]) .====Atomic Structure====: The most common [[non-metalStable Isotope|stable isotope]] of [[elementOxygen]] with has 8 [[protonneutron]]s in its [[Atomic Nucleus|nucleus]] giving it an [[Relative Atomic Mass|atomic mass]] of 16.: [[Oxygen]] is in [[Period]] 2 of the [[Periodic Table]] because it has 2 [[Electron Orbital|electron shells]].: [[Oxygen]] has 6 [[electron]]s in its [[Outer Shell|outer shell]] and needs 2 more to get a full [[Outer Shell|outer shell]] so it can form 2 [[bond]]s with other [[atom]]s. ====Properties====: [[Oxygen]] is [[gas]] at [[STP|standard temperature and pressure]].
====Testing for Oxygen====
#Collect the [[gas]] in a [[Test Tube|test tube]].
#Place a glowing [[Wooden Splint|splint]] over the mouth of the [[Test Tube|test tube]].
#If the [[Wooden Splint|splint]] relights then the [[gas]] is [[Oxygen]].