Chemical Bonds, Lewis Symbols and the Octet Rule

Chemical Bonds

Types of Bonds
Results from the electrostatic attraction and cations between and anions.
In ionic compounds, electrons transfer from cations to anions.
Example: NaCl
Results from sharing of electrons between two non-metallic atoms. In ionic compounds, electrons transfer from cations to anions.
Exists mainly among non−metallic elements.
Example: HCl
Mainly found in metals, where the metalsbonding electrons are free to move throughout the 3D structure of the metal.
Example: Na

Lewis Symbols

SymbolIt shows the symbol of each element as well as the number of the valence(outermost) electrons,on which bonding depends.Every valence electron is shown as a doton the element symbol. Dots are located around the 4 sides of the symbol, so that each side can be occupied by a max. of 2 dots.
lewis-symbols sulfur

Examples of Lewis Symbols and Relation with the Period Table

The # of dots in a Lewis symbol is the same as the group #
The number of valence electrons can be predicted from a Lewis Symbol.
lewis-symbols-table lewis-symbols-2


The Octet Rule

The Octet Rule Applications in:

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Date of last modification: Summer , 2019