本题目来源于试卷: Models of Bonding & Structure B.3 The Metallic Model，类别为 IB化学
[单选题]
Based on periodic trends, which series ma7w jb. + 3sn5,i;nr pwp7-ux2mg ek ,/qvnrncorre sz2atz2p9rnd zo mj ,2y55z1gctly orders the elements by increasing melting m za1zypo5s2dzg52zrjtn, 92points?
A. Rb, Sr, Zr, Cs
B. Cs, Zr, Sr, Rb
C. Cs, Rb, Sr, Zr
D. Zr, Sr, Rb, Cs
参考答案: C
本题详细解析:
The strength of metallic bondingtd7t2lg5/ io;48qtsg gx+ ojw and therefore melting point, decreases down a group due to increasing atomic radius (more energy levels) and greater separation of the nuclei. Cs it isjtood/t7w +;l4x5 g82qg gs in period 6, while all other 3 elements are in period 5. Hence, Cs has the lowest melting point. Since atomic radius decreases across a period due to increased effective nuclear charge, the strength of metallic bonding, and therefore melting point, increases from Rb to Zr.
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