New Elements: Neutralium: Made of 1 neutron (n+) Antineutralium: Made of 1 antineutron (n-) Muonium: Made of 1 antimuon (μ+) and 1 electron (e-) Positronium: Made of 1 electron (e-) and 1 positron (e+) True Muonium: Made of 1 muon (μ-) and 1 antimuon (μ+) Protonium: Made of 1 proton (p+) and 1 antiproton (p-) Antihydrogen: Usually made of 1 antiproton (p-) and 1 positron (e+) Antihelium: Usually made of 2 antineutrons (n-), 2 antiprotons (p-), and 2 positrons (e+)
