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Warm up

Which atom best represents a Carbon atom?. Warm up. Electron Cloud. It’s a small world after all PLEASE!!!! D o not sing this terribly annoying song. The electrons swirling around the nucleus of an atom are called the electron cloud.

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Warm up

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  1. Which atom best represents a Carbon atom? Warm up

  2. Electron Cloud It’s a small world after all PLEASE!!!! Do not sing this terribly annoying song

  3. The electrons swirling around the nucleus of an atom are called the electron cloud. • This ‘cloud’ contains all the electrons in a given atom. Valence electrons

  4. The electron cloud has different energy levels that electrons must follow in, called electron shells. • We will only look at the first three. • The following shells can hold: 1st shell-Up to 2 electrons 2nd shell- up to 8 electrons 3rd shell- up to 18 Electron cloud

  5. Vocab: Valence electrons: Electrons on the outermost shell of an atom. • So how many valence electrons do these atoms have? Valence electrons

  6. model- a simple version of a more complicated system or concept. Models make something easier to understand. Models

  7. Just label the shells • The Bohr Model The Bohr model- shows ALL the electrons, protons, and neutrons in an atom. Draw in IAN

  8. Scientist use a more simple way to represent atoms and their valence electrons than the Bohr model. • An electron dot diagram shows ONLY the valence electrons of an atom and its name. • Next, draw the same carbon atom using the electron dot diagram. Electron dot diagrams

  9. Draw in IAN the C (Carbon atom) and draw an arrow to the valence electrons. Electron Dot model Bohr model Bohr model vs. Electron dot

  10. Vocab: • Rule of eight- all atoms want to have 8 valence electrons to fill up their outer shell. • The atom will do whatever it can to make the rule of 8. This is a perfect time to introduce the atoms rule of eight

  11. The atom will give valence electrons away or steal from other atoms to make their outer shell have 8 electrons. Electrons, not money----> This is a perfect time to introduce the atoms rule of eight

  12. An atom reacts with another atom based on its # of valence electrons. (electrons on the outer shell) • An atom is unstable and wants to react because of its # of valence electrons. • EVERY chemical reaction happens because # of valence electrons

  13. This ‘stealing’ and ‘sharing’ is how ALL reactions happen!!! Lets do this on the board!!!!!

  14. Another example. • The electron is stolen by the Cl atom and the Na atom wants to get rid of it • Why?

  15. Remember those things called ions!

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