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We present the measurements of individual bound electron $g$ factors of$^{20}\text{Ne}^{9+}$ and $^{22}\text{Ne}^{9+}$ on the relative level of$0.1\,\text{parts}$ per billion. The comparison with theory represents the moststringent test of bound-state QED in strong electric fields. A dedicated massmeasurement results in$m\left(^{20}\text{Ne}\right)=19.992\,440\,168\,77\,(9)\,\text{u}$, whichimproves the current literature value by a factor of nineteen, disagrees by $4$standard deviations and represents the most precisely measured mass value inatomic mass units. Together, these measurements yield an electron mass on therelative level of $0.1\,\text{ppb}$ with$m_{\text{e}}=5.485\,799\,090\,99\,(59) \times 10^{-4}\,\text{u}$ as well as afactor of eight improved$m\left(^{22}\text{Ne}\right)=21.991\,385\,098\,2\,(26)\,\text{u}$.

High-precision determination of $g$ factors and masses of $^{20}\text{Ne}^{9+}$ and $^{22}\text{Ne}^{9+}$