Question

which statement describes a major drawback of the bohr model that caused scientists to replace it? it worked only for helium and larger atoms. it did not identify the distance between an electron and the nucleus. it contradicted the heisenberg uncertainty principle. it stated that spectral lines of atoms are similar.

Explanation:

The Bohr model assumed electrons had fixed orbits with known positions and momenta. The Heisenberg uncertainty principle states that one cannot simultaneously know both the position and momentum of a particle precisely. So, the Bohr model contradicted this principle.
The Bohr model worked well for hydrogen - like atoms (not helium and larger atoms as wrongly stated in option 1). It did give a formula for the distance of electrons from the nucleus in hydrogen - like atoms (so option 2 is wrong). Spectral lines of atoms are different (so option 4 is wrong).

Answer:

It contradicted the Heisenberg uncertainty principle.