Bohr's model of the atom fixed Rutherford's instability problem by proposing that electrons:
AAre stationary and do not orbit the nucleus at all
BMove in random spirals towards the central nucleus
COccupy only fixed orbits (shells) with quantised energies
DCarry zero charge and contribute nothing to atomic mass
Answer & Solution
Correct answer: C. Occupy only fixed orbits (shells) with quantised energies
Bohr (1913) proposed that electrons can only occupy specific orbits with fixed energies. They don't lose energy in orbit (so don't spiral in). Energy is emitted/absorbed only on jumps between orbits.
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