OCR A 2.2.1 Electron Structure REVISION
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OCR A 2.2.2 Bonding and structure REVISION
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OCR A 3.1.1 Periodicity REVISION
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Electron Configuration - Basic introduction
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Electronic Configuration | AS-Level Chemistry
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Shells, Subshells, and Orbitals - BIOLOGY/CHEMISTRY EP5
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BTEC Applied Science: Unit 1 Chemistry Electron Configuration
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OCR A 2.1.2 & 2.1.3 Amount of Substance, Compounds, Formulae and Equations REVISION
20:21