ws3f10key - CH301 Fall 2010 Worksheet 3 Answer Key Electron...

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CH301 Fall 2010 Worksheet 3 Answer Key: Electron Configurations and Periodic Trends 1. Match the following elements with their corresponding electron configurations 2. Write the electron configuration of arsenic (As) in long notation and in short (noble gas) notation. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 3 [Ar] 4s 2 3d 10 4p 3 3. Write the electron configuration of a divalent cobalt cation (Co 2+ ) in long and in short notation. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 5 [Ar] 4s 2 3d 5 4. Write the electron configuration of a monovalent astatine anion (At - ) in long and in short notation. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6 [Xe] 6s 2 4f 14 5d 10 6p 6 5. Write the electron configuration of ununoctium (Uuo), atomic number 118, in long and in short notation. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6 7s 2 5f 14 6d 10 7p 6 [Rn] 7s 2 5f 14 6d 10 7p 6 6. Although it can’t be found on any periodic table, what would element 120’s electron configuration be, in long and short notation? 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6 7s 2 5f 14 6d 10 7p 6 8s 2 [Uuo] 8s 2
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