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Chemical Bonding

Chemical Bonding. To bond or not to bond that is the question?. T he Bohr model…but simpler. The Lewis Dot Structure is a simplified way to show the arrangement of valence electrons

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Chemical Bonding

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  1. Chemical Bonding To bond or not to bond that is the question?

  2. The Bohr model…but simpler • The Lewis Dot Structure is a simplified way to show the arrangement of valence electrons • Valence Electrons are electrons in the outer shell and determine the atom’s chemical properties (whether it will bond or not) • Valence electrons are located in the outer/last shell

  3. How to determine the number of VE • Look at the group the element is located in to determine how many valence electrons an element gets • Transition Metals (groups 3-12) only have 2 valence electrons • When looking at groups 13-18, just look at the number after the “1” and that’s the number of VE

  4. How to draw a Lewis Dot Diagram • Write the atomic symbol • Identify the number of valence electrons (look at the group #) • Using clockwise order, draw each valence electron around the element symbol. • There are only four spaces around the element and each space can only hold a maximum of 2 electrons

  5. Let’s try one together…Argon • Remember the maximum electrons each shell can hold. Ar

  6. Now you try…

  7. Chemical Bond • An interaction (joining together) that holds two or more atoms or ions together to form new substances with different properties • The goal of atoms bonding is to get a complete or full outermost shell. This is called an Octet

  8. Types of Bonds • Ionic Bond – bonds that forms when electrons are transferred from one atom to another (electrons gained or lost) • Ions are positive and negative charged particles that form when atoms gain or lose electrons • Covalent Bond – bonds formed when atoms share one or more pair of electrons • Metallic Bond – chemical (covalent) bonding that results from the attraction between metal atoms and electrons

  9. Stable or Unstable • Stable – non reactive (does not want to bond) Full outer shell • Unstable – Reactive (wants to bond) (outer most shell not full)

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