First Name Section M T W R EXAM 2 REVIEW-07. Lewis Structures of Atoms
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1 Last Name Do Date First Name Section M T W R EXAM 2 REVIEW-07 Lewis Structures of Atoms General Information Notes-29-Lewis Structures of Atoms (You will have to download it/you don t have a class version of it) Chapter 5.8 Electron Dot Formulas Chapter 5.7 Valence Electrons (Review) Chapter 5.6 Blocks of Elements, p. 144 only: Electron Configurations of Elements You will need Appendix 0 (Periodic Table) for this assignment. You may also need Appendix 6. However, you will not access to Appendix 6 for Exam 2. Remember: Max Time is given as a guideline. If you use Max Time for every question on the Exam 2, you will not finish the Exam. General Information Notes-30-Lewis Structures of Atoms (You will have to download it/you don t have a class version of it) Part 1 State the number of valence electrons for each atom, and write the Lewis Dot Structure. You do not need to show your work from the. Max Time: 1 min/each 1) carbon 2) bromine Page 1 of 9
2 3) gallium 4) potassium 5) xenon Page 2 of 9
3 Part 2 Write the for each element In the, circle the orbitals that are in the valence shell. State the number of valence electrons, and write the Lewis Dot Structure for the atom. Max Time: 3 min/each Sample 1) aluminum ANSWERS Sample 1) aluminum Al: 1s 2 2s 2 2p 6 3s 2 3p 1 3 Use the Periodic Table and the pattern that you have memorized to write the. If you are still having problems, use Appendix 6 (Aufbau Principle) until you no longer need to. If you do not know how to use Appendix 6 to write the, you are behind and should ask questions on the day before the Exam or during Office Hours. The third energy level is the highest one filled. Therefore, I look for any orbital where the first number is three. There are two electrons in the 3s orbital. There is one electron in the 3p orbital. Therefore, there are a total of three valence electrons in the outermost energy level. Page 3 of 9
4 6) nitrogen 7) platinum 8) Iodine Page 4 of 9
5 9) lithium 10) arsenic Page 5 of 9
6 Solutions If you cannot solve these problems, I highly suggest you go back and work from your notes before trying to work backwards from the answer key. Explanation 1) carbon 4 All elements in Group 4A (also known as Group IVA or Group 4) have 4 valence electrons. Explanation 2) bromine 7 All elements in Group 7A (also known as Group VIIA, Group 17, and Halogens) have 7 valence electrons. Explanation 3) gallium 3 All elements in Group 3A (also known as Group IIIA or Group 3) have 3 valence electrons. Explanation 4) potassium 1 All elements in Group 1A (also known as Group IA, Group 1, or Alkali Metals) have 1 valence electron. Explanation 5) xenon 8 All elements in Group 8A (also known as Group VIIIA, Group 18, or Nobel Gases) have 8 valence electrons. Page 6 of 9
7 6) nitrogen N: 1s 2 2s 2 2p 3 5 N The second energy level is the highest one filled. Therefore, I look for any orbital where the first number is two. There are 2 electrons in the 2s orbital. There are 3 electrons in the 2p orbital. Therefore, there are a total of five valence electrons. 7) platinum Pt: 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 8 2 The sixth energy level is the highest one filled. Therefore, I look for any orbital where the first number is six. There are 2 electrons in the 6s orbital. There are no other electrons on the sixth energy level. Thus, there are a total of two valence electrons. Page 7 of 9
8 8) Iodine I: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 5 7 The fifth energy level is the highest one filled. Therefore, I look for any orbital where the first number is five. There are 2 electrons in the 5s orbital. There are 5 electrons electron in the 5p orbital. Thus, there is a total of seven valence electrons. 9) lithium Li: 1s 2 2s 1 1 The second energy level is the highest level filled. Therefore, I look for any orbital where the first number is 2. There is 1 electron in the 2s orbital. There are no other electrons in the second energy level. Therefore, there is only 1 valence electron. Page 8 of 9
9 10) arsenic As: 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 3 5 The fourth energy level is the highest one filled. Therefore, I look for any orbital where the first number is 4. There are 2 electrons in the 4s orbital. There are 3 electrons in the 4p orbital. Therefore, there are a total of seven valence electrons. Page 9 of 9
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