Module 7 Atoms and Periodic Trends 1 2 3 4 5 6 Pauli Exclusion Principle Atomic Subshell Energies Electron Assignment Electron Configuration of Atoms Electron Configuration of Ions Atomic Properties Periodic Trends Periodic Trends Chemical Properties Quantum Numbers n shell row l shape s p d f g h ml l l ms ConcepTest Which orbital has the quantum numbers m l 1 l 1 n 4 A 4s B 4p C 4d D 4f E 3d F none of these n just the row l s 0 p 1 d 2 f 3 no more than n 1 ConcepTest What are acceptable quantum numbers n l ml respectively for a 4d orbital A n 3 l 4 ml 0 B n 3 l 3 ml 1 C n 4 l 3 ml 1 D n 4 l 2 ml 0 E n 4 l 1 ml 1 E none of these Row Shell 1 1s 2 2s 2p 3 3s 3p 3d 4 4s 4p 4d 4f 7 orbitals 5 s p d f g 6 s p d f g h subshell e2 2 6 2 6 10 2 6 10 14 Shell e2 8 18 32 50 72 ConcepTest Which two orbitals have the same value for n l A 2s 2p B 2s 3s C 2p 3p D 2p 3s E 3p 3d F none of these Place the orbitals 3d 4s 4p 5s in order of increasing energy 5 4 5 5 A 3d 4s 4p 5s B 3d 4s 5s 4p C 4s 4p 3d 5s D 4s 3d 4p 5s E 4p 4s 3d 5s F 4p 3d 4s 5s Electron Assignments Aufbau Principle fill vacant orbitals of lowest energy Assign to subshell in order of increasing n l value For same n 1 value lower n value first ConcepTest Which element has 3d orbitals occupied by electrons AF B Cl C Br DK E Ca F none of these ConcepTest What is the electron configuration for chlorine A 1s22s22p5 B He 2s22p5 C He 3s23p5 D Ne 3s23p5 E Ne 3s13p6 E none of these Hund s Rule 1s 2s 2p B v v C v v v N v v O v v v F v v v v ConcepTest Which transition metal has the electron configuration Kr 4d 55s1 AV B Cr C Nb D Mo E Tc F none of these