Question

why does the metal wire in the circuit demo let electricity flow through it?
it contains free - moving electrons that carry the current
it reflects light waves during the test
it has empty space between atoms
it is connected to a battery
question 2
what atomic - level feature gives metals their strength?
tightly packed atoms in a regular structure
electrons that float between atoms
energy from the battery

Explanation:

Metals conduct electricity because they have free - moving electrons. In a metal wire, these electrons can carry the electric current. When a potential difference (such as from a battery) is applied, the free electrons move through the metal lattice.

Answer:

It contains free - moving electrons that carry the current.