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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

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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