Answer :
Final answer:
The wave-mechanical model of the atom depicts electrons as being in orbitals outside the nucleus, determined by their energies and described using probability density distributions.
Explanation:
The wave-mechanical model of the atom describes the location of electrons as being in orbitals outside the nucleus, unlike the older planetary model where electrons were thought to move in circular orbits around the nucleus. In the wave-mechanical model, electrons are described using probability density distributions or electron clouds, reflecting their wave-like behavior.
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