Of the 26 monoisotopic elements that have only a single stable isotope, all but one have an odd atomic number and all but one also have an even number of neutrons.
ʌvðə twˈɛnti sˈɪks mˌɑːnoʊˌɪsətˈɑːpɪk ˈɛlɪmənts ðæt hæv ˈoʊnli ɐ sˈɪŋɡəl stˈeɪbəl ˈaɪsətˌoʊp, ˈɔːl bˌʌt wˈʌn hæv ɐn ˈɑːd ɐtˈɑːmɪk nˈʌmbɚ ænd ˈɔːl bˌʌt wˈʌn ˈɔːlsoʊ hæv ɐn ˈiːvən nˈʌmbɚɹ ʌv nˈuːtɹɑːnz.