Potential answers for "Hydrogen has one"

⭐⭐⭐⭐ PROTON
⭐⭐⭐⭐ ELECTRON
⭐⭐⭐ ODOR
⭐⭐ ELEMENT
⭐⭐ GAS
⭐⭐ AMINO
⭐⭐ ZEPPELINS
⭐⭐ NEUTRON
⭐⭐ ISOTOPES

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Onetime White House nickname   Blue, on some maps: Abbr.   Ready to take part