Used to show an element and the number of valence electrons.

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Presentation transcript:

Used to show an element and the number of valence electrons. Lewis Dot Structures Used to show an element and the number of valence electrons.

Writing Lewis Dots First write the chemical symbol Second, determine the number of valence electrons Draw the appropriate number of dots around the symbol making sure to put one dot on each side before putting a second dot.

Fun Valence Electron Facts: Valence electrons are the electrons in the highest occupied energy level of an atom. It is the number of valence electrons that will determine the chemical properties of the element. Valence electrons are the only electrons used in chemical bonds.

Finding the Valence electrons Since the element is not carrying a charge, there are equal numbers of protons and electrons. Remember: The number of protons is equal to the atomic number. Begin filling in the energy levels. When done, count the electrons in the outer shell. OR, remember the shortcut. The group number of a main group element tells us the number of valence electrons. Group 1 has 1 valence electron, Group 2 has 2 VE.….etc.

Electron Config. (ends in..) Group Electron Config. (ends in..) Valence e- e- Dot 1 ns1 2 ns2 13 ns2 np1 3 14 ns2 np2 4 15 ns2 np3 5 16 ns2 np4 6 17 ns2 np5 7 18 ns2 np6 8 Teacher: Fill in e-dot column with students in their notes.

Practice: Write the Lewis dot structure for: Al N C