Valence Electrons

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Slide 1

Valence Electrons:

ELECTRONS AVAILABLE FOR BONDING

Slide 2

CA Standards

Students know how to use the periodic table to determine the number of electrons available for bonding.

Students know how to draw Lewis dot structures.

Slide 3

Definition

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

Slide 4

Group 1 (alkali metals) have 1 valence electron

Slide 5

Group 2 (alkaline earth metals) have 2 valence electrons

Slide 6

Group 13 elements have 3 valence electrons

Slide 7

Group 14 elements have 4 valence electrons

Slide 8

Group 15 elements have 5 valence electrons

Slide 9

Group 16 elements have 6 valence electrons

Slide 10

Group 17 (halogens) have 7 valence electrons

Slide 11

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

Slide 12

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

Slide 13

Lanthanides and actinides

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

Slide 14

Dot Notations

An atom’s valence electrons can be represented by Lewis dot notations.

Slide 15

Dot Notations – Period 2

Lewis dot notations for the valence electrons of the elements of Period 2.