Question

why is aluminium better conductor than magnesium?​

Answer 1

To be a good conductor the current should flow easily. Flow of electron is current. If electrons are available more then they easily moves from the valence band to conduction band and they act as good conductor. Al has 1s²2s²2p⁶3s²3p¹ electron and it loses its valence electron quickly. Whereas Mg has ​ 1s²2s²2p⁶3s² which is a stable configuration and so it wont lose its electron quickly. That is why the Al acts as good conductor than Magnesium