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Warm Up

Warm Up. Write the equation for the release of a beta particle by Pb-211 2. Write the equation for Po-219 undergoing 1 alpha decay. Warm Up. Write the equation for the release of a beta particle by Pb-211 Pb  e + Bi 2. Write the equation for Po-219 undergoing 1 alpha decay.

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Warm Up

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  1. Warm Up • Write the equation for the release of a beta particle by Pb-211 2. Write the equation for Po-219 undergoing 1 alpha decay.

  2. Warm Up • Write the equation for the release of a beta particle by Pb-211 Pb  e + Bi 2. Write the equation for Po-219 undergoing 1 alpha decay. Po  He + Pb 211 211 0 -1 83 82 4 219 215 84 2 82

  3. Electron configuration and periodic trends

  4. - Electrons occupy orbitals around the nucleus- Electrons in a particular path have fixed energy

  5. The energy level of an electron is the region around the nucleus where the electron is likely to be moving. • Principle energy levels are assigned values in order of increasing energy • n = 1, 2, 3, 4

  6. Each energy level can be divided into sublevels

  7. The sublevels each hold a set amount of electrons • s - can hold 2 e- • p - can hold 6 e- • d - can hold 10 e- • f - can hold 14 e-

  8. Orbital Diagram

  9. This diagram represents the electron configuration for Carbon

  10. This diagram represents the electron configuration for Carbon The red arrows represent the possible locations of electrons shared with carbon when in a covalent bond.

  11. Review: • What is a valence electron? • How many valence electrons are found in Oxygen?

  12. Periodic Trends • Atomic Size • Ionization energy • Electronegativity

  13. Atomic Size (Radius) • Increases down a group • Decreases left to right

  14. Atomic Size (Radius) • Increases down a group • Decreases left to right

  15. Atomic Size (Radius) • Increases down a group • Decreases left to right

  16. Ionization Energy • The energy required to overcome the attraction of the nuclear charge and remove an electron from a gaseous atom • Increases left to right across a period • Decreases down a group

  17. What do you notice about the elements at the peaks and valleys?

  18. Electronegativity • The tendency for the atoms of an element to attract electrons when they are chemically combined with atoms of another element • Increases left to right across a period • Decreases going down a group

  19. Let’s practice!!!

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