Ontario Grade 9 Science Class Practice Exam

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Master Grade 9 Science with our comprehensive practice exam. Test your knowledge, identify weak areas, and boost your confidence for academic success.

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What allows electrons to move easily through it?

Conductor
Insulator
Semiconductor
Vacuum

The correct answer is: Conductor

Conductors have loosely held or free electrons that are able to move easily through the material. This is due to the fact that the outer electrons of the atoms in a conductor are not as tightly bound to the nucleus, allowing them to move more freely and carry electric current. On the other hand, insulators have electrons that are tightly bound to the atoms and do not move easily, hence inhibiting the flow of electricity. Semiconductors, while able to conduct electricity to a certain extent, do not allow electrons to move as easily as conductors do. And in a vacuum, there are no atoms present to allow for the flow of electrons, making it impossible for electricity to flow. Therefore, out of the given choices, only a conductor has the capability to allow for the easy movement of electrons.