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==Key Stage 4==
===Meaning===
[[Hydrogen]] ('''H<sub>2</sub>''')is a [[gas]]eous (at [[Room Temperature|room temperature]]) [[non-metal]] [[element]] with 1 [[Chemical Symbol|symbolproton]] '''H''' and a in its [[Relative Atomic MassNucleus|relative atomic massnucleus]] of 1.
===Testing for Hydrogen===