The correct answer is Option 3: Positronium
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Option 1: Hydrogen-1: This is the most common and stable isotope of hydrogen, consisting of one proton and one electron.
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Option 2: Deuterium: This is a stable isotope of hydrogen that contains one proton and one neutron. It does not undergo radioactive decay.
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Option 3: Positronium: This is a short-lived system made of an electron and a positron that quickly annihilate each other
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Option 4: Protium: This is simply the scientific name for Hydrogen-1. Like Option 1, it is a completely stable isotope.
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