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Chapter 15 Ionic Bonding and Ionic Compounds DIRECTIONS: COPY ONLY THE UNDERLINED INFO! PowerPoint Presentation
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Chapter 15 Ionic Bonding and Ionic Compounds DIRECTIONS: COPY ONLY THE UNDERLINED INFO!

Chapter 15 Ionic Bonding and Ionic Compounds DIRECTIONS: COPY ONLY THE UNDERLINED INFO!

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Chapter 15 Ionic Bonding and Ionic Compounds DIRECTIONS: COPY ONLY THE UNDERLINED INFO!

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  1. Chapter 15Ionic Bonding and Ionic CompoundsDIRECTIONS: COPY ONLY THE UNDERLINED INFO!

  2. What is an Ionic Bond?

  3. Ionic Bond Bond formed between a metal and nonmetal.

  4. Why do atoms bond? • Atoms bond in order to acquire a full set of valence electrons. • Most of the time this is 8 . This is known as the octet rule. • Atoms will gain, lose or share in order to attain a full set of electrons

  5. Valence Electrons • The electrons responsible for the chemical properties of atoms are those in the outer energy level. These electrons are called the valence electrons. • Valence electrons - The electrons in the outer energy level

  6. Electron Configuration

  7. Keeping Track of Electrons • Atoms in the same column... • Have the same valence electrons. • LABEL! 

  8. Electron Dot diagrams • A way of keeping track of valence electrons. • How to write them? • Write the symbol. • Put one dot for each valence electron • Don’t pair up until they have to (Hund’s rule) X

  9. The Electron Dot diagram for Nitrogen • Nitrogen has 5 valence electrons. • First we write the symbol. N • Then add 1 electron at a time to each side. • Until they are forced to pair up.

  10. Write electron dot diagrams: • Na • Mg • C • O

  11. Electron Configurations for Cations • Metals lose electrons to attain noble gas configuration. • They make positive ions (cations) • If we look at the electron configuration, it makes sense to lose electrons: • Na 1s22s22p63s1 1 valence electron • Na1+1s22s22p6 noble gas configuration

  12. Electron Configurations for Anions • Nonmetals lose electrons to attain noble gas configuration. • They make negative ions (anions) • If we look at the electron configuration, it makes sense to lose electrons: • F 1s22s22p5 2 valence electrons • F-1 1s22s22p6 noble gas configuration

  13. Properties of Ionic Compounds • A regular repeating arrangement of ions in the solid: this is known as a lattice. Structure is rigid. • High melting points

  14. Crystalline structure

  15. Do they Conduct? • Conducting electricity is allowing charges to move. • In a solid, the ions are locked in place. • Ionic solids are insulators. • When melted, the ions can move around. Therefore, they have the ability to conduct electricity • Ionic Compounds dissolved in water conduct

  16. Completing the Circuit