1 / 26

Intro to Electron Configuration

Intro to Electron Configuration. Objective Today I will be able to: Calculate the electron configuration for elements on the periodic table Evaluation/ Assessment

wgenevieve
Download Presentation

Intro to Electron Configuration

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Intro to Electron Configuration

  2. Objective • Today I will be able to: • Calculate the electron configuration for elements on the periodic table • 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

  3. Lesson Sequence • Warm – Up • Explain: How to write electron configurations • Elaborate: write electron configurations with a partner for questions 1-18 • Evaluate: review the questions as a class (informal assessment) • Explain: electron configurations in 3d orbitals and Aufbau diagrams • 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) • Exit Ticket

  4. Warm - Up • What is an electron? • What is the abbreviation for an electron? • How does the mass of an electron compare to the other subatomic particles? • Do you believe in electrons? • How do we know electrons exists and how they move and behave?

  5. Objective • Today I will be able to: • Calculate the electron configuration for elements on the periodic table

  6. Homework • Electron Configuration Practice

  7. Agenda • Warm – Up • Halloween Demos (as promised)  • Electron Configuration Notes • Electron Configuration Practice • Exit Ticket

  8. Electron Configuration

  9. Electron Configuration • Electron configuration – arrangement of electrons in an atom • Electrons try to populate the lowest energy levels available – “ground state”

  10. Arrangement of Energy Levels • Principal energy levels – represented by n • As atoms get bigger, there are more electrons, therefore more energy levels • Within each energy level, we have one or more sublevels • These sublevels are made up of orbitals

  11. Orbitals • According to modern atomic theory electrons are found in orbitals • Orbital – 3-D region around the nucleus indicating the probable location of the electron • There are 4 types of orbitals where the electrons can be found – s,p,d,f • Order of energy from lowest to highest: • s, p, d, f

  12. Energy Sublevels • Each sublevel occupies a specific location on the periodic table:

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

  14. Orbitals cont. • Each sublevel can hold a specific amount of electrons • S=2 • P=6 • D=10 • F=14

  15. 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

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

  17. Electron Configuration Practice Complete numbers 1-18

  18. 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

  19. 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

  20. Aufbau Diagram

  21. Complete Electron Configuration Practice Worksheet 19 - 36

  22. 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

  23. 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

  24. 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

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

  26. Exit Ticket • Write the electron configuration of sulfur

More Related