January 2020 NY Regents Chemistry Exam
1 Which statement describes a concept included in the wave-mechanical model of the atom?
(1) Protons, neutrons, and electrons are located in the nucleus.
(2) Electrons orbit the nucleus in shells at fixed distances.
(3) Atoms are hard, indivisible spheres.
(4) Electrons are located in regions called orbitals.
Solution: According to the wave-mechanical model of the atom electrons are located in regions called orbitals.
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