Final answer:
Electrons flow from the negative terminal of the battery, through the connected LED, and towards the positive terminal, completing the circuit and lighting the LED without violating the law of conservation of charge.
Step-by-step explanation:
When an LED is properly connected by wires to a battery, electrons will leave the negative terminal of the battery and flow through the wire toward the bulb. In an electric circuit, such as the one involving a simple LED, the battery serves as a source of electromotive force (emf). Electrons naturally flow from a point of lower potential to a point of higher potential. Inside the battery, a chemical reaction occurs that separates charges, resulting in an excess of negative charge on the negative terminal. This makes the negative terminal repel electrons, while the positive terminal attracts them. The connected wire provides a path for the electrons to travel from the negative terminal, through the LED (which lights up as a result), and towards the positive terminal, completing the circuit without violating the law of conservation of charge since it's a closed system.