Question

Why do metals conduct electricity while nonmetals do not conduct electricity?

Answer 1

upper one :

Each metal atom contributes one or more electrons . Note:-free and mobile electrons are responsible for high thermal and electrical conductivity of metals. metals contain lot of free electrons while nonmetals don't have it. metals conduct electricity due to the presence of free electrons which are absent in non-metals.

down one :

metals are good conductors of both heat and electricity, whereas nonmetals generally cannot conduct heat or electricity. ... Metalloids tend to be shiny like metals but brittle like nonmetals. Because they are brittle, they may chip like glass or crumble to a powder if struck.