Curriculum
Chemistry — Second Secondary
Chemistry — Second Secondary
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2.1Lesson 1: Early atomic models — Thomson and Rutherford2.21.1 Thomson's atomic model (1897)2.31.2 Rutherford's gold foil experiment2.41.3 Postulates of Rutherford's atomic model (1911)2.52.1 Atomic emission (line) spectrum2.62.2 Bohr's atomic model (1913)2.72.3 The hydrogen spectrum explained2.82.4 Success of Bohr's model2.92.5 Shortcomings of Bohr's model2.10Lesson 3: The modern atomic theory2.113.1 Dual nature of the electron2.123.2 Heisenberg's uncertainty principle2.133.3 Wave-mechanical theory (Schrödinger, 1926)2.143.4 Electron cloud and orbital2.15Lesson 4: Quantum numbers2.164.1 Principal quantum number (n)2.174.2 Subsidiary quantum number (ℓ)2.184.3 Magnetic quantum number (mℓ)2.194.4 Spin quantum number (ms)2.204.5 Relations between n, sublevels, orbitals and electrons2.21Lesson 5: Distribution of electrons in the atom2.225.1 Pauli's exclusion principle2.235.2 Aufbau (building-up) principle2.245.3 Hund's rule2.255.4 Putting it together — rules checklist
Chemistry — Second Secondary 2026/2027
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