Explain why Na, Mg, and Al are good conductors of electricity?

Metals include sodium, magnesium, and aluminum, to name a few. They have metallic bonding, which means that the nuclei of metal atoms are attracted to delocalised electrons, which is a form of attraction.

The transition from sodium to aluminum:

The number of electrons that are delocalized is increasing...
A greater number of electrons is available to transport and carry charge across the structure...
The electrical conductivity rises as a result of this.

I hope this helps you
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D. most models represent a real world object in a simpler way