Electronic Structure of Atoms Worksheet
Grade 12 Chemistry worksheet covering the electronic structure of atoms, including quantum numbers, electron configurations, and periodic trends.
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Standards
Topics
Electronic Structure of Atoms
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Read each question carefully and answer to the best of your knowledge. Show all your work for calculations.
1. Which of the following describes the maximum number of electrons that can occupy a single atomic orbital?
1
2
6
10
2. What is the electron configuration for a neutral atom of Oxygen (O)?
1s²2s²2p⁴
1s²2s²2p⁶
1s²2s²2p³
1s²2s¹2p⁵
3. The quantum number describes the size and energy of an atomic orbital.
4. According to Hund's Rule, electrons will occupy separate orbitals within a subshell with spins before pairing up.
5. The Pauli Exclusion Principle states that no two electrons in an atom can have the same set of four quantum numbers.
6. Explain the significance of the principal quantum number (n) in describing the electronic structure of an atom.
7. Write the full electron configuration for a neutral atom of Chlorine (Cl).
8. All orbitals within a given subshell have the same energy.
True
False
9. The magnetic quantum number (ml) describes the orientation of an orbital in space.
True
False
Match each term with its correct definition.
10. Aufbau Principle
a. No two electrons in an atom can have the same four quantum numbers.
11. Pauli Exclusion Principle
b. Electrons fill orbitals starting with the lowest energy level.
12. Hund's Rule
c. Orbitals of equal energy are each occupied by one electron before any orbital is occupied by a second electron.
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