CHEM 1F92 Lecture Notes - Lecture 15: Diamagnetism, Transition Metal, Isoelectronicity
10 Feb 2017
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Chemistry lecture (15); electron configurations (7. 7) & periodic properties of the elements (8. 1 8. 6) Orbitals in h atoms are described by three quantum numbers: n, l, ml. Which e- configuration violates the aufbau principle: a (doesn"t fill up the orbitals before moving on) Which e- configuration represents c in it"s ground state: d (fills up orbitals in order and in opposite spins) Half- filled and filled subshells have lower energy. And therefore we need to change the e- filling order. 1s2 2s2 2p6 3s2 3p6 4s2 3d4 or. 1s2 2s2 2p6 3s2 3p6 4s1 3d5 short hand is [ar] 4s1 3d5. Use bottom equation as a half filled 3d subshell is more stable! Use first equation as a filled 3d subshell is more stable! ** try these on your own: molybdenum (mo) and silver (ag)** Groups 1 and 2 s block; 2 electrons. Groups 3 and12 d block; 10 electrons. Groups 13 and 18 p block; 6 electrons.
