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Electron Configuration, Electron Lab

Electron Configuration, Electron Lab. Objective Today I will be able to: Calculate the electron configuration for elements on the periodic table Construct a model of where electrons in the 1s orbital are located. Evaluation/ Assessment

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Electron Configuration, Electron Lab

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  1. Electron Configuration, Electron Lab

  2. Objective • Today I will be able to: • Calculate the electron configuration for elements on the periodic table • Construct a model of where electrons in the 1s orbital are located. • Evaluation/ Assessment • Informal assessment – student responses when reviewing electron configuration problems. Listening to group interactions on practice sheets and lab • Formal Assessment – collecting and analyzing responses to electron configuration worksheet 2 and the where is the electron lab?

  3. Lesson Sequence • Warm – Up • Elaborate: write electron configurations with a partner for questions 1-18 • Evaluate: review the questions as a class (informal assessment) • Explain: electron configurations using 3d orbitals. • Elaborate: Students will complete 19-36 on electron configuration WS with a partner • Evaluate: review the questions as a class (informal assessment) • Explain: abbreviated electron configurations • Elaborate: Students will add a column to the WS and repeat write the abbreviated configuration • Evaluate: Abbreviated configurations will be reviewed as a class (informal assessment) • Explore: Students will be sorted into groups and will complete the where is the 1s electron lab located • I will be assessing students progress during the lab as I monitor group discussions • Evaluate: Students will complete an electron configuration WS (assessment) • Explain: principles, rules and diagrams of electron configurations • Exit Ticket

  4. Warm - Up • How many electrons can each orbital hold? • s = • p = • d = • f = • Write the electron configuration for the following elements • Helium • Nitrogen • Silicon

  5. Objective • Today I will be able to: • Calculate the electron configuration for elements on the periodic table • Construct a model of where electrons in the 1s orbital are located.

  6. Homework • Electron Configuration Practice

  7. Agenda • Warm – Up • Electron Configuration Practice • Electron Configuration Notes • Electron Configuration Practice • Where’s the electron Lab • Exit Ticket

  8. Electron Configuration Practice Complete numbers 1-18

  9. Electron Configuration

  10. Electron Configuration n 1 2 3 4 5 6 7 p-block s-block d-block n-1 f-block n-2

  11. Electron Configurations • We can write the electron configurations for each element (assuming the atom has a neutral charge) representing the location of the elements electrons in the energy levels

  12. Examples • Sodium (Na) • Has 11 electrons (when neutral) • Electron Configuration: • 1s22s22p63s1 • Cobalt (Co) • Has 27 electrons (when neutral) • Electron Configuration • 1s22s22p63s23p64s23d7

  13. Why does 4s come before 3d? • 3d is of slightly higher energy than 4s, but 4s is further from the nucleus • It takes less energy for a 3d electron to form pairs then a 4s electron

  14. Aufbau Diagram • Instead of using the periodic table as a road map, you can use the aufbau diagram to determine the order that the electrons occupy the different energy levels • Electrons fill the lowest energy orbitals first

  15. Aufbau Diagram

  16. Complete Electron Configuration Practice Worksheet 19 - 36

  17. Abreviated Electron Configuration • Scientists are lazy ;) • We need a shorthand way to represent electron configuration • It would take a long time to write the configuration for elements with a lot of electrons • How do we do this? • Noble Gas Configuration

  18. Noble Gas Configuration • The last column on the periodic table is referred to as the noble gases • To write in abbreviated configuration: • Find the last noble gas within the configuration • Write the symbol • Write the remaining configuration • Example • Ca - 1s2 2s2 2p6 3s2 3p6 4s2 • Noble Gas Configuration = [Ar] 4s2

  19. Noble Gas Configuration • Writing Noble Gas Configurations for ions is a little bit different • Must account for an electron being gained or lost • Chlorine Ion = Cl-1 • [Ne] 3s2 3p6 • Sodium Ion = Na+1 • [He] 2s2 2p6

  20. Electron Configuration Practice Go back and write the Abbreviated (Noble Gas) configuration for the elements on the worksheet on the right hand margin

  21. Where is the electron lab?

  22. Electron Configuration Practice 2

  23. More Electron Configuration Rules and Principles

  24. Pauli Exclusion Principle • An orbital can hold a max of 2 e- • To occupy the same orbital, they must spin in opposite directions • If 2 e- occupy an orbital, they are said to be “paired” • If only 1 e- is present in an orbital, it is “unpaired”

  25. Pauli Exclusion Principle

  26. Hund’s Rule • e- occupy orbitals so that a max number of unpaired e- result • More stable arrangement

  27. Orbital Diagram • Shows the electrons in their sublevels • Represented with arrows

  28. Orbital Diagram 1s 2s 2px 2py 2pz H ↑ ↑ ↓ He C ↑ ↓ ↑ ↓ ↑ ↑ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ ↑ ↓ Ne

  29. Exit Ticket • Draw an orbital diagram representing the arrangement of the electrons in sulfer

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