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Atomic Structure (II)
- 5. Order of filling orbitals © my-chem-tutor.blogspot.com [1] Fill orbitals with lower energy 1st [Aufbau Principle] [2] Each orbital can accommodate 2 electrons [Pauli Exclusion Principle] [3] Where there is a choice between orbitals of equal energy, fill the orbitals singly 1st [Hund’s Rule] (minimise electron repulsion) 4s orbital is lower in E than 3d ( when unfilled )!
- 6. Electronic configuration © my-chem-tutor.blogspot.com Examples: Ca O Cl Si Na 20 40 11 23 8 35 16 17 28 14 B 5 11 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 1s 2 2s 2 2p 6 3s 1 1s 2 2s 2 2p 4 1s 2 2s 2 2p 5 1s 2 2s 2 2p 6 3s 2 3p 2 1s 2 2s 2 2p 1