Part J Electronic Configuration, Periodic Table and periodic trends 4 slides per page

according to increasing energy aufbau principle 2p6 o

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Unformatted text preview: ectron Configurations • How do we arrange electron orbitals in an atom? - According to increasing energy! Aufbau Principle 2p6 o 2p - ___ ___ ___ 1s 4s lower than 3d! 2s 3s 4s 5s 6s 7s 2p 3p 4p 5p 6p 7p 3d 4d 5d 6d 7d 4f 5f 6f 7f 2 1/28/2014 Writing Electronic Configurations • Hund’s Rule – in filling-up orbitals, electrons must occupy them singly first before pairing • Pauli’s Exclusion Principle – no two electrons should have the same set of quantum numbers 1s Configuration ↑ 1s1 1 2 Writing Electronic Configurations H He ↑↓ 1s 2 Writing Electronic Configurations Condensed Configuration [He] 2s1 [He] 2s 2 [He] 2s 2 2p1 [He] 2s 2 2p 2 [He] 2s 2 2p 3 [He] 2s 2 2p 4 [He] 2s 2 2p 5 [ Ne] 3 1/28/2014 [He] [Ne] [Ar] [Kr] [Xe] 2 2 2 2 2 1s 2s 2p 6 3s 4s 5s [Rn] 6s 2 7s 2 3p 6 4p 6 5p 6 6p 6 7p 6 3d10 4d10 5d10 6d10 7d 14 14 6f • A “period” refers to elements belonging to the same initial s orbital that is filled up (before a new s orbital could be filled) 7f 4f 5f - Only 118 elements are known at present - Element 118 ends at 7s2 7p6 Electronic Configurations and Periodic Table – Across a period, electrons are added to an initial s orbital then passes through all other orbitals according to Aufba...
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