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Nov 284:16 PM
Aim: Drawing L.D.D. using valence
electrons for atoms and ions.
Lewis Dot Diagrams
Unit 3 The Periodic Table
Topic 5 in Review Book
Nov 284:16 PM
**1. Based on the oxidation state, if Magnesium became an ion, would it gain or lose electrons and how many?
- What is the electron configuration for the magnesiumatom?
- What is the electron configuration for the magnesiumion?** Do Now https://www.youtub
Nov 284:16 PM
Lewis Dot Diagrams (L.D.D)
- Lewis^ Dot^ Diagram/Structure:^ a^ diagram^ that
represents the valence electrons of an atom or ion.
Sr S
Strontium atom Sulfur atom
Nov 284:16 PM
- Lewis^ Dot^ Diagram/Structure:^ a^ diagram^ that
represents the valence electrons of an atom or ion.
- (^) Draw the element symbol.
- (^) Draw the # of valence e‐ as dots around the symbol.
- (^) DO NOT DRAW MORE THAN 2e‐ on any one side of the symbol.
- (^) Maximum # valence e‐= 8
Sr S
Strontium atom Sulfur^ atom
Nov 284:16 PM
Sr S
Strontium ion Sulfide ion
Strontium atom Sulfur atom
Sr
lost 2e as it formed, so
no electrons are drawn.
S
‐
gained 2e as it formed,
so 8e‐ are drawn.
Nov 284:16 PM
Lewis D
Sr S
Strontium ion Sulfide ion
Strontium ion Sulfide ion
- (^) Positive ion L.D.D. have no e‐ drawn.
- (^) Insert the charge and brackets. 1. (^) Negative ion L.D.D. have a full shell of valence e‐ 2. (^) Insert the charge and brackets.
Sr S
loses these 2 valence e‐ gains 2 valence e‐
Nov 284:16 PM
Draw a L.D.D. for each atom and ion:
METAL CATION
NONMETAL ANION
- Nitrogen^ atom
- Nitride^ ion
Ba N
Ba N
Nov 284:16 PM
L.D.D. Rules Summary
atom: shows # of valence e‐ on the periodic table. ‐No more than 2e‐ drawn on any one side. positive ion: NO e‐ drawn to show the ion formed by losing e‐ ‐Draw the charge (oxidation #) and brackets. negative ion: draw a full valence shell of e‐ to show the ion formed by gaining e‐ ‐Draw the charge (oxidation #) and brackets.
Nov 284:16 PM Do Now https://www.youtube.com/watch?v=ji_25I_q4LQ https://www.angelo.edu/faculty/kboudrea/demos/sodium_chlorine/ sodium_chlorine.htm
