Name: Worksheet: Electron Configurations. I Heart Chemistry!
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1 1. Which electron configuration represents an atom in an excited state? 1s 2 2s 2 2p 6 3p 1 1s 2 2s 2 2p 6 3s 2 3p 2 1s 2 2s 2 2p 6 3s 2 3p 1 1s 2 2s 2 2p 6 3s 2 Worksheet: Electron Configurations Name: Period: 9. Which sublevel configuration correctly represents a completely filled third principal energy level? 3s 2 3p 6 3d 8 3s 2 3p 6 3d 10 3s 2 3p 2 3d 10 3s 2 3p 6 3d 5 2. All of the elements in Period 3 have a total of 2 electrons in the 2s sublevel 2p sublevel 3s sublevel 3p sublevel 3. Which atom in the ground state has three unpaired electrons in its outermost principal energy level? Li N B Ne 4. What is the total number of valence electrons in an atom with the electron configuration 1s 2 2s 2 2p 6 3s 2 3p 3? Which orbital notation represents an atom of beryllium in the ground state? 6. Which element has a completely filled third principal energy level? Ar Fe N Zn 7. Which atom in the ground state has only 3 electrons in the 3p sublevel? phosphorus argon potassium aluminum 8. What is the total number of occupied principal energy levels in a neutral atom of neon in the ground state? Which atom in the ground state contains a partially filled 3p orbital? argon potassium calcium aluminum 11. In the ground state, the atoms of elements in Period 2 all have the same number of protons 1s electrons neutrons oxidation states 12. Which is the electron configuration for a neutral atom in the ground state? 1s 2 2s 2 3s 1 1s 2 2s 2 2p 6 3p 1 1s 2 2s 2 2p 4 3s 1 1s 2 2s 2 2p 6 3s Which represents the electron configuration of an isotope of oxygen in the ground state? 1s 2 2s 2 2p 1 1s 2 2s 2 2p 2 1s 2 2s 2 2p 2 1s 2 2s 2 2p The total number of sublevels in the fourth principal energy level of an atom is Which is a possible electron configuration for argon in the excited state? 1s 2 2s 2 2p 7 3s 2 3p 5 1s 2 2s 2 2p 6 3s 1 3p 7 1s 2 2s 3 2p 5 3s 2 3p 6 1s 2 2s 2 2p 6 3s 2 3p 5 4s Which is a correct description of the shape and spatial orientation of the p orbitals in an atom? All have the same shape but a different orientation. All have the same shape and the same orientation. All have a different shape and a different orientation. All have a different shape but the same orientation. 17. A maximum of 6 electrons can occupy an s orbital a p orbital an s sublevel a p sublevel 18. How does the ground state electron configuration of the hydrogen atom differ from that of a ground state helium atom? Hydrogen has one electron in a higher energy level. Hydrogen has two electrons in a lower energy level. Hydrogen contains a half-filled orbital. Hydrogen contains a completely filled orbital.
2 19. Which electron transition represents the release of energy? 1s to 3p 3p to 1s 2s to 2p 2p to 3s 20. Which orbital notation correctly represents the outermost principal energy level of a nitrogen atom in the ground state? 23. What is the total number of orbitals in a p sublevel Which represents the electron configuration of the outermost principal energy level of a Group 15 element in the ground state? s 2 p 3 s 1 p 3 s 2 p 5 s 1 p Which is the orbital notation for the electrons in the third principal energy level of an argon atom in the ground state? 21. Which orbital notation correctly represents the outermost principal energy level of a sulfur atom in the ground state? 26. Which electron configurations represent the first two elements in Group 17 (VII of the Periodic Table? 1s 2 2s 1 and 1s 2 2s 2 1s 2 2s 2 and 1s 2 2s 2 2p l 1s 2 2s 2 2p 5 and [Ne]3s 2 3p 5 1s 2 2s 2 2p 6 and [Ne]3s 2 3p Which orbital notation correctly represents the outermost principal energy level of oxygen in the ground state? 22. In an atom of lithium in the ground state, what is the total number of orbitals that contain only 1 electron? Which sublevels are occupied in the outermost principal energy level of an argon atom in the ground state? 3s and 3d 2s and 3p 3s and 3p 2p and 3d
3 29. An atom with the electron configuration of ls 2 2s 2 2p 6 3s 2 3p 6 3d 5 4s 2 has an incomplete 2p sublevel second principal energy level third principal energy level 4s sublevel 30. In the ground state, which element's atoms have five completely filled orbitals? Li C B Ne
4 Answer Key 1. A 2. A 3. C 4. D 5. C 6. D 7. A 8. B 9. C 10. D 11. C 12. D 13. D 14. D 15. D 16. A 17. D 18. C 19. C 20. A 21. D 22. A 23. C 24. A 25. B 26. C 27. C 28. B 29. C 30. D
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Atoms are mostly empty space Atomic Structure Two regions of every atom: Nucleus - is made of protons and neutrons - is small and dense Electron cloud -is a region where you might find an electron -is
19.1 Bonding and Molecules
Most of the matter around you and inside of you is in the form of compounds. For example, your body is about 80 percent water. You learned in the last unit that water, H 2 O, is made up of hydrogen and