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CHEMICAL BONDING

CHEMICAL BONDING

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CHEMICAL BONDING

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  1. CHEMICAL BONDING How do elements bond?

  2. Objectives: • Identify the different ways an element bond. • Compare and contrast ionic and covalent bond. • Distinguish between compound and molecules.

  3. Why it’s important? • Chemical Bonds join the atoms in the materials you use everyday.

  4. Vocabulary: • Ion • Ionic bond • Covalent bond • Polar bond • Metallic bond • Molecule

  5. Review: Valence Electrons • Valence electrons are the electrons in the highest (last outer energy) occupied energy level of the atom. • Valence electrons are the only electrons generally involved in bond formation.

  6. What is an ion? • Atom or molecule that is no longer neutral since it has lost or gained an electron.

  7. Define Chemical Bonding? • Elements that do not have a complete energy level, tend to react. • When the elements react, chemical bonds are formed.

  8. How do atoms bond? • Atoms form bonds with other atoms using electrons in their outer energy level.

  9. What are the different ways atoms bond? • Gain Electron (+) • Lose Electron (-) • Pooling Electron (together) • Sharing Electron

  10. 1. Ionic Bond: • Chemical bonding holding oppositely charged ions together. • Between a metal and non metal • Responsible for gaining or losing electrons.

  11. Example: Na

  12. A Positive Ion (Cation): • An atom that has lost one or more electrons. • + charge

  13. Example: Cl

  14. A Negative Ion (Anion) • An atom that has gained one or more electrons. • Negatively (-) charged.

  15. Chemical Bond Between Na & Cl : Ionic Bond

  16. Some Common Ions

  17. 2. Covalent Bonding: • Share Electrons. • Bond that forms between non metals only. • Produce molecular compounds. • Ex. Hydrogen Molecule

  18. Ex. Covalent Bonding

  19. 2 Forms: • Double Bond: when 2 pairs of electrons are shared. • Triple Bond: when 3 pairs of electrons are shared.

  20. 3. Metallic Bonding: • Bond between metal and another metal. • Electrons in the outer energy level are not tightly held together----move freely (pooled) • Electrons stick together • Responsible for good conductivity, malleability and ductility.

  21. 4. Polar Bond: • Bond in which electrons are shared unevenly. • Ex. Water

  22. Video • https://youtu.be/ljvX-RMv_lw