# Bohr radius for single electron orbits

xiankai
for ions with more than one proton ie. He+, Li2+ and Be3+, doesn't the extra charge factor into the equation? because it seems only the elementary charge is http://en.wikipedia.org/wiki/Bohr_radius" [Broken], hence rendering it independent of amount of positive charge present.

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Yes. For ions with a single electron but $Z$ protons, replace $e$ with $Ze$, where $e$ is the unit charge $1.60 \times 10^{-19}$ C.