Question

question 9 (5 points)
which of the following required bohrs model of the atom to need modification?
a) an electrons energy increases the farther it moves from the nucleus.
b) electrons do not follow circular orbits around the nucleus.
c) energies of electrons are quantized.
d) quantized electron energies are responsible for emission spectra lines.

Explanation:

Bohr's model proposed electrons move in circular orbits around the nucleus. However, later quantum mechanics showed electrons exist in orbitals (probability clouds) and do not follow fixed circular paths. Option A is a part of Bohr's model (energy increases with distance from nucleus), Option C (quantized energy) and D (emission spectra due to quantized energy) were also part of Bohr's model. Only Option B contradicts Bohr's orbital concept, requiring model modification.

Answer:

B) Electrons do not follow circular orbits around the nucleus.