本题目来源于试卷: Classification of Matter A.1 Periodic Table Elements Classification，类别为 IB化学
[单选题]
Which of the following statements are true regarding c0q 2eheh-hz:the trans3i8*hgbv 5vx ngtbt +e-2bud:ition metals?
I. Only the electrons found in the d orbitals are involved in bonding
II. Transition metals typically have higher electrical conductivity due to the metallic bonding of the d orbital electrons
III. All of the 3d block metals will form colored compounds
A. $I$, $II$, and $III$
B. $I$ and $II$ only
C. $I$ only
D. $II$ only
参考答案: D
本题详细解析:
Explanation: I. The 3d and 4s orbitals are close in energy and all are involved in bonding. The 4s and 3d electrons make up the delocalized electrons that create the strong metallic bonding found in transition metals resulting in many of the desirable physical characteristics such as strength, high melting point, high thermal and electrical conductivity. II. Transition metals generally have higher electrical conductivity than other metals due to their partially filled d-orbitals. In transition metals, the partially filled d-orbitals are more diffuse than the s-orbitals, which means they can more easily overlap with neighboring atoms to form metallic bonds. As a result, transition metals tend to have a higher density of conduction electrons, leading to higher electrical conductivity. III. Zn will not form colored compounds due to the complete 3d sublevel. Generally, Zn is not considered a transition metal. Additionally, the most common ion of $Sc^{3+}$ does not form colored compounds because both the single 3d electron and the two 4s electrons are lost in this common form of the ion.
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