1.3.1: Emission Spectra: Exploring how the study of emission spectra provided evidence for quantised energy levels in atoms and laid the foundation for modern atomic models 

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1.3.2: Hydrogen Emission Spectrum: Understanding how specific electron transitions in the hydrogen atom produce distinct spectral lines and how these transitions relate to energy level differences.

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1.3.3: Energy Level Convergence and Ionization: Explaining the concept of convergence in emission spectra and how it indicates the ionization energy and limits of electron binding

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1.3.4: The Quantum Mechanical Model: Introducing the quantum mechanical model of the atom, where electrons are treated as probability clouds in orbitals rather than fixed orbits.

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1.3.5: Electron Configuration: Describing how electrons are arranged in atoms using electron configurations and orbital diagrams, applying principles such as Aufbaul, Pauli Exclusion, and Hund’s Rule.

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