4.5: METALLIC BOND

Metallic Bonding

DEFINITION: The electrostatic force between the positively charged metal ions and the ‘sea’ of delocalized valence electrons.

HOW DOES IT WORK?                                                                                                     

Diagram 1: Formation of Metallic Bond

               Diagram 2: Example of metallic bond (Na) in 'Electrons Sea Model'

             Diagram 3: Example of metallic bond (Mg) in 'Electrons Sea Model'

When the number of valence electrons increases in a metal, the strength of metallic bonding increases.

Requirement to draw ELECTRON SEA MODEL in order to show METALLIC BOND: -

1) Number of atom in each a row is at least 2 atoms.

    - they must be in straight line

2)The number of valence electrons & number of metal atoms must be accurately shown in the 'Electrons Sea Model'.

- Example: if in the model you want to show 4 atoms of Na, and each Na has                    1 valence electrons. Thus it must have 4 valence electrons                                shown. 

*** To explain formation of Metallic bond, refer to DIAGRAM 1 & draw 'Electrons Sea Model' .                   

***MELTING & BOILING POINT IN PERIOD 3 

    Please read this part in the lecture notes

GOOGLE FORM CHAPTER 4.5

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