Potential answers for "One of two in a proton"

⭐⭐⭐⭐ UPQUARK
⭐⭐ ATOMS
⭐⭐ ATOM
⭐⭐ BETADECAY
⭐⭐ ACID
⭐⭐ ANTI
⭐⭐ DONOR
⭐⭐ HYDROGENION

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