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Select the sentence that best describes why copper and some other metals are good conductors.

A) Copper atoms have loosely held electrons; this means they can freely move in and out of the nucleus of the atom.
B) Copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.
C) Copper and some other metals have highly active inner shells. This means that electrons can be freely exchanged between shells.
D)Copper has a small number of electrons; this means it can easily shed these electrons and take electrons from other atoms.

Respuesta :

B) Copper atoms have a loosely held free electron in their outer shell that is able to move freely to other atoms.
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Answer:

B) Copper atoms have loosely held free electrons in their outer shell that is able to move freely in other atoms.

Explanation:

A material which has loosely held free electrons in its outermost shell is always a good conductor. These loosely held free electrons move from atoms to atoms and cause conductivity. It is known that copper and other metals are good conductors. Therefore, option (B) supports the argument and is a right answer.

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