Quantum Mechanics and Atomic Models Quiz

Grade 12 · Science · Quiz

Test your knowledge of quantum theory, atomic structure, and electron configuration.

Questions

Which model first introduced the concept of quantized electron energy levels?
1. Thomson model
2. Rutherford model
3. Bohr model
4. Schrödinger model
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Answer: Bohr model
Bohr proposed that electrons orbit the nucleus in specific quantized energy levels, explaining hydrogen's emission spectrum.
An s orbital has a dumbbell shape.
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Answer: False
An s orbital is spherical. The p orbital has a dumbbell shape.
What is the maximum number of electrons in the n=3 energy level?
1. 8
2. 18
3. 32
4. 6
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Answer: 18
The n=3 level contains 3s (2), 3p (6), and 3d (10) subshells for a total of 18 electrons.
The ___ principle states that electrons fill the lowest available energy orbitals first.
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Answer: Aufbau
The Aufbau principle (German for 'building up') describes filling orbitals from lowest to highest energy: 1s, 2s, 2p, 3s, 3p, 4s, 3d...
Which scientist developed the wave equation that describes electron behavior?
1. Niels Bohr
2. Werner Heisenberg
3. Erwin Schrödinger
4. Max Planck
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Answer: Erwin Schrödinger
Schrödinger's wave equation (1926) provides the mathematical framework for quantum mechanics and describes electron probability distributions.
In Hund's rule, electrons pair up in one orbital before occupying other orbitals of the same subshell.
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Answer: False
Hund's rule states electrons occupy separate orbitals of the same subshell before pairing up, and all single electrons have the same spin.
The magnetic quantum number (ml) for a p subshell can have how many values?
1. 1
2. 2
3. 3
4. 5
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Answer: 3
For l=1 (p subshell), ml can be -1, 0, or +1 — three possible orientations corresponding to px, py, and pz orbitals.
Wave-particle ___ describes how subatomic particles exhibit both wave and particle properties.
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Answer: duality
Wave-particle duality is confirmed by electron diffraction experiments showing electrons produce interference patterns characteristic of waves.
The Pauli Exclusion Principle allows two electrons to share all four quantum numbers if they are in different atoms.
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Answer: False
The Pauli Exclusion Principle applies within a single atom — no two electrons in the same atom can have identical sets of all four quantum numbers.
An electron in the 2p subshell has which value of l?
1. 0
2. 1
3. 2
4. 3
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Answer: 1
The p subshell corresponds to l=1 regardless of the principal quantum number n.

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