1 / 11

Topic: Atomic Concepts Aim: How are electrons arranged in an atom? Do Now:

Topic: Atomic Concepts Aim: How are electrons arranged in an atom? Do Now: Draw a Bohr model for S-32. HW:. What about electrons?. Atomic # = ____ & ____ (for a neutral atom) # of neutrons = ____ The protons & neutrons are located ___ How are electrons arranged in the electron cloud?.

didier
Download Presentation

Topic: Atomic Concepts Aim: How are electrons arranged in an atom? Do Now:

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. Topic: Atomic Concepts Aim:How are electrons arranged in an atom? Do Now: Draw a Bohr model for S-32. HW:

  2. What about electrons? • Atomic # = ____ & ____ (for a neutral atom) • # of neutrons = ____ • The protons & neutrons are located ___ • How are electrons arranged in the electron cloud?

  3. Arrangement of Electrons • Principal Energy Levels (PELs) • Show distance from nucleus • Up to 7 PELs • Electrons in different shells have different energies. • Low PEL# = close to nucleus = low energy • High PEL# = far from nucleus = high energy

  4. Atom with PELs n = 1, low energy n = 2, more energy n = 3, more energy than 2 Nucleus containing p & n

  5. How many e- can each PEL hold?

  6. Electron Configuration • How e- fill the PELs – how many e- are in each PEL • Always start with PEL #1 (closest to the nucleus) & work your way out • Once PEL #1 is full, the rest of the e- start to fill in PEL #2 till it’s full • This info is on the PERIODIC TABLE!

  7. Example Electron Configuration The 2 means there are 2 electrons in PEL #1. (PEL #1 is full.) The 4 means there are 4 electrons in PEL #2.

  8. More Examples • Magnesium & Zinc – for each… • Atomic # • # of e- • e- config • # of PELs occupied

  9. Valence Electrons • OUTERMOST e- • These e- participate in chemical rxns with other atoms • Give an element its chemical properties • Last # of e- configuration • How many valence e- does magnesium have? Zinc? Valence e-

  10. Lewis Dot Structures • Shows VALENCE e- as DOTS around ATOMIC SYMBOL • Symbol will have a MAXIMUM of 8 dots! Why? • • X • • • • • •

  11. Examples • Draw the Lewis structures for the following elements: • Helium • Sulfur • Boron • Nitrogen • Neon

More Related