Amazing stuff ...
Donald Fleming of the University of British Columbia in Vancouver, Canada, and colleagues managed to disguise a helium atom as a hydrogen atom by replacing one of its orbiting electrons with a muon, which is far heavier than an electron.
But I guess that was actually pretty simple because in 1987 ...
... a type of ultra-light hydrogen, called muonium, ... Chemists formed this by replacing the proton in a hydrogen atom with an antimuon, the muon's positively charged antimatter partner.
For more, see Atomic Disguise Makes Helium Look like Hydrogen by , January 28, 2011 at New Scientist.
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