What is metallic or electronic conductivity? On what factors does it depend?

(N/A) Definition: The flow of electric current through metals due to the movement of electrons is known as metallic or electronic conductivity.
Factors affecting metallic conductivity:
$i$. Nature and structure of the metal.
$ii$. Number of valence electrons per atom.
$iii$. Temperature: As the temperature increases,the conductivity decreases because of the increased vibration of metal ions which hinders the flow of electrons.
Key characteristic: Since electrons enter at one end and exit through the other,the chemical composition of the metallic conductor remains unchanged.