References: Atomic Structure and Mass Spectrometry
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Mass Spectrometry - Wikipedia - Covers the principles, instrumentation, ionization methods, and applications of mass spectrometry, directly supporting the Chapter 2 sections on mass spectrum analysis and relative abundance.
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Isotope - Wikipedia - Explains the definition of isotopes, their notation, natural abundance, and examples across the periodic table, underpinning the Chapter 2 treatment of average atomic mass calculations.
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Mole (unit) - Wikipedia - Covers the historical development and definition of the mole, Avogadro's number, and the relationship between atomic mass units and grams per mole central to Chapter 2's mole concept section.
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Chemistry: The Central Science (14th ed.) - Brown, LeMay, Bursten, Murphy, Woodward - Pearson - Chapters 2 and 3 address subatomic particles, atomic number, mass number, isotopes, average atomic mass, mass spectrometry, molar mass, percent composition, and empirical and molecular formulas at full AP depth.
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Chemistry (10th ed.) - Zumdahl & Zumdahl - Cengage - Chapter 3 provides thorough coverage of atomic theory, the mole concept, molar mass calculations, percent composition, empirical formulas, and combustion analysis with extensive worked examples and problem sets.
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Atoms and The Atomic Theory - LibreTexts Chemistry (Petrucci et al.) - Covers subatomic particles, atomic number and mass number, isotopes, atomic mass, the mole concept, and Avogadro's number with detailed explanations and practice problems aligned to Chapter 2.
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Electron Configuration - LibreTexts Chemistry (Physical and Theoretical Chemistry) - Covers electron configurations for neutral atoms and ions using quantum numbers and the Aufbau, Pauli, and Hund principles, providing conceptual groundwork that connects Chapter 2 atomic structure to Chapter 3.
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AP Chemistry Course Overview - College Board AP Students - Official resource detailing the AP Chemistry curriculum units and exam structure, helping students understand how Chapter 2 atomic structure and mole calculations relate to stoichiometry and later exam topics.
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Build an Atom - PhET Interactive Simulations (University of Colorado) - Interactive simulation for building atoms from subatomic particles, exploring isotope notation, atomic number, mass number, and ion formation — all core topics in Chapter 2's subatomic particle and isotope sections.
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NIST Periodic Table of Elements - NIST Physical Measurement Laboratory - Authoritative periodic table with critically evaluated atomic masses for all elements, the definitive reference for the average atomic mass values used in Chapter 2 mole calculations and percent composition problems.