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Chemistry

Chemistry. If H 2 O is the formula for water, what is the formula for ice? H 2 O cubed. Lewis Structures. Valence Electrons. Recall: Valence Electrons are electrons located on the outer orbit E.g. Lewis Structures.

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Chemistry

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  1. Chemistry If H2O is the formula for water, what is the formula for ice? H2O cubed. Lewis Structures

  2. Valence Electrons Recall: • Valence Electrons are electrons located on the outer orbit • E.g.

  3. Lewis Structures • When atoms form compounds, valence electrons are the ones that are involved in the bonding • Valence electrons are the electrons found in the outermost orbit (energy level) • Lewis structures show atoms depicting their valence electrons only – much easier then Bohr-Rutherford Diagrams

  4. Rules • Symbol of the element is in the center and represents protons, neutrons and inner electrons (electrons not in outer orbit) • The symbol is assumed to have 4 sides, and the electrons in the outermost energy level are placed as dots on the four sides. • Dots are placed singly, and are then paired up in the order (N S E W).

  5. How do we know the number of Valence Electrons an atom has? • Valence electrons are the electrons in the outer orbit surrounding an atom in a Bohr-Rutherford Diagram • What is the shortcut to finding the number of valence electrons?

  6. Shortcut • Find the group number the element is in while skipping the transition metals • The group number = the number of valence electrons

  7. How to draw a Lewis Dot Diagram • http://www.youtube.com/watch?v=y6QZRBIO0-o

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