Nhận biết (M1)

According to the free electron model, metals, such as copper and silver, do not maintain bonds by sharing and exchanging electrons. __________ metals are held together by a system of valence electrons that travel freely, interacting with neither ions nor each other. This framework for understanding the subatomic relationships within metals can be used to help explain heat and electrical conductivity.

Which choice completes the text with the most logical transition?

• A.

  For example,

• B.

  Rather,

• C.

  Accordingly,

• D.

  Likewise,