For He, just add electrons

February 2, 2012

Has Peter B. Baker not heard of alpha particles ("Compound the error", Letters, 26 January)? These are helium nuclei. Just add electrons. No need for chemistry, alchemy or nuclear fusion: radioactive fission can do the job. University College London's Ray Dolan presumably already knew this and thought it too obvious to mention.

Dave Kimber, St Neots, Cambridgeshire

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