Chemical behaviour of a helium muonide atom /Heo/ can be understood on the analogy of its hydrogen homologues, muonium /Mu/, deuterium /Do/ and tritium /To/. In muon catalyzed fusion /CF/, a small fraction of negative muon in the fusion cycle sticks to helium to give proton-like He+ which easily picks up one electron forming Heo. The energy of He+ at birth is about 3.5 MeV being in a similar situation to the case of a hot tritium atom produced by /n, p/ or /n, / reaction. The reaction cross section and rate of Heo reactions are estimated.