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Reference.org
Bohr radius
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<p>The Bohr radius ( a 0 {\displaystyle a_{0}} ) is a <a href="/facts/Physical_constant/uI2QvAHw">physical constant</a>, approximately equal to the most probable distance between the <a href="/facts/Atomic_nucleus/orpIm5Xl">nucleus</a> and the <a href="/facts/Electron/L0KBo5cW">electron</a> in a <a href="/facts/Hydrogen_atom/ncVpPbuE">hydrogen atom</a> in its <a href="/facts/Ground_state/ML7cfCug">ground state</a>. It is named after <a href="/facts/Niels_Bohr/ydLPvQXT">Niels Bohr</a>, due to its role in the <a href="/facts/Bohr_model/FmTHjaxy">Bohr model</a> of an atom. Its value is 5.29177210544(82)×10−11 m. </p>