# Why is the Bohr model obsolete and what can it still be used for?

With hydrogen-like atoms, that event doesn't happen. In a hydrogen-like atom, such as ${\text{He}}^{+}$ or ${\text{Li}}^{2 +}$, which has only one electron, there is no such repulsive coulombic interactions that cause instantaneous repulsions.
However, when you have more than one electron, it complicates the electron's motion; chemists get all in a rut because of that instantaneous repulsion, which changes the ground-state energy $E$ of that element pseudo-randomly, and it becomes impossible to directly calculate it exactly by conventional means.