Objectives Know how to use the periodic table to determine the number of electrons available for bonding. Know how to draw Lewis dot structures.

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Presentation transcript:

Objectives Know how to use the periodic table to determine the number of electrons available for bonding. Know how to draw Lewis dot structures.

ELECTRONS AVAILABLE FOR BONDING Valence Electrons: ELECTRONS AVAILABLE FOR BONDING

Definition Valence electrons are electrons in the outmost shell (energy level). They are the electrons available for bonding.

Group 1 (alkali metals) have 1 valence electron

Group 2 (alkaline earth metals) have 2 valence electrons

Group 13 elements have 3 valence electrons

Group 14 elements have 4 valence electrons

Group 15 elements have 5 valence electrons

Group 16 elements have 6 valence electrons

Group 17 (halogens) have 7 valence electrons

Group 18 (Noble gases) have 8 valence electrons, except helium, which has only 2

Transition metals (“d” block) have 1 or 2 valence electrons

Lanthanides and actinides (“f” block) have 1 or 2 valence electrons

Dot Notations An atom’s valence electrons can be represented by Lewis dot notations. 1 valence e- X 2 valence e- 3 valence e- 4 valence e- 5 valence e- 6 valence e- 7 valence e- 8 valence e-

Li Be B C N O F Ne Dot Notations – Period 2 Lewis dot notations for the valence electrons of the elements of Period 2. lithium Li beryllium Be boron B carbon C nitrogen N oxygen O fluorine F neon Ne