VALENCE ELECTRONS Rule for Electrons 1 st Ring = Max 2 Electrons 2 nd Ring = Max 8 Electrons 3 rd Ring = Max 8 Electrons.

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Presentation transcript:

VALENCE ELECTRONS Rule for Electrons 1 st Ring = Max 2 Electrons 2 nd Ring = Max 8 Electrons 3 rd Ring = Max 8 Electrons

Valence Electrons Recall … Electrons in the outermost energy level (shell, orbit, rings) VALENCE ELECTRONS are called VALENCE ELECTRONS Ex. 16 electrons: This element has 6 valence electrons. # electrons = # protons (Atomic Number) The valence shell

Main Group Valence shells Grp As we move from left to right we add one electron at a time To the outermost energy level – the Valence shell 1e 2e 3e 4e 5e 6e 7e 8e

Electron Dot Diagrams (Lewis Structures) To draw: 1. Write chemical symbol 2. Place one dot around chemical symbol for each valence electron (up to eight dots)

Lewis dot Structures for the atoms of groups 1-2 and of The periodic table The Main group elements Notice the valence electron trends