Physical science unit 1
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Physical Science Unit 1. Chapter 5 Lesson 3 Covalent Bonds. Start Up. Objectives: Explain covalent bonds Write electron-dot diagrams for simple molecules. Answer the following question: How are molecules formed?. Covalent Bonds. A bond where valence electrons are shared between atoms

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Physical Science Unit 1

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Physical science unit 1

Physical ScienceUnit 1

Chapter 5

Lesson 3

Covalent Bonds


Start up

Start Up

  • Objectives:

    • Explain covalent bonds

    • Write electron-dot diagrams for simple molecules

  • Answer the following question:

  • How are molecules formed?


Covalent bonds

Covalent Bonds

  • A bond where valence electrons are shared between atoms

    • Enables atoms to form molecules


Diatomic molecule

Diatomic Molecule

  • A molecule made up of two atoms of the same element

    • Electrons are shared equally

    • Only elements can have diatomic molecules:

      • Nitrogen

      • Oxygen

      • Hydrogen

      • Chlorine

      • Bromine

      • Iodine

      • Flouride


Hard to see

Hard to See!

  • Covalent bonds are hard to visualize, so scientists came up with a diagramming method to show these bonds

    • Called electron-dot diagram

      • A model in which the chemical symbol represents the nucleus and all the filled inner energy levels of the atom and one dot represents each valence electron


Let s do it

Let’s Do it!

  • Let’s do some electron dot diagrams together


Homework

Homework

  • Complete electron-dot ws in packet

  • Answer review questions


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