1. Follow the electron configuration order chart to answer this question. a) H :

Question

1. Follow the electron configuration order chart to answer this question.

a) H : level: 1, sublevel: s , 1s1

b) Zn: level: 3, sublevel: d , 1s22s22p63s23p63d104s2

c) S: level: 3, sublevel: p , 1s22s22p63s23p4

d) U: level: 6, sublevel: d , 1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p65f36d17s2

e) Cl: level: 3, sublevel: p , 1s22s22p63s23p5

2

a) Fe3+ = [Ar]3d5 : Fe --> [Ar]3d6 4s2, Fe3+ looses 3 electrons and the from s shell are lost before d shell due to lower energy and d shell prefers either partially full (5) or completely full (10) shell

b) Se2- = [Kr] or [Ar] 3d10 4s2 4p6 : Se has 34 electrons and it gains 2 more, thereby resembling nobel gas : Krypton in terms of electronic configuration

c) Cd2+ = [Kr]4d10 : Cd --> [Kr]4d10 5s2, Cd2+ looses 2 electrons and the electrons from s shell are lost before d shell due to lower energy and d shell prefers either partially full (5) or completely full (10) shell

d) P3- = [Ar] or [Ne] 3s2 3p6: P --> [Ne] 3s2 3p3, P3- gains 3 electrons and resembles the nogel gas Argon in terms of electronic configuration

Explanation / Answer

Use the Periodic Table and identify the highest energy sub-level occupied in the following elements: b) Zn_ d) U e) Cl Write the abbreviated electronic configuration of the following ions: a) Fe3 b) Se2 c) Cd2* d) p3

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