Question

which scientist proposed that electrons travel in fixed paths in the atom? image of an atom with 11 p, 12 n, and electron paths options: niels bohr, james chadwick, ernest rutherford, john dalton

Explanation:

To solve this, we analyze each scientist's contributions:

• Niels Bohr proposed the Bohr model of the atom, where electrons orbit the nucleus in fixed, circular paths (energy levels).
• James Chadwick discovered the neutron.
• Ernest Rutherford proposed the nuclear model of the atom (with a dense nucleus), but not fixed electron paths.
• John Dalton proposed the atomic theory with indivisible atoms (no electron path concept).

So Niels Bohr is the correct choice.

Answer:

A. Niels Bohr