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, whuu j/t *y4p;s4voc c(/dq(xcmich series correctly orders the elements (u.jtghx6p.d by increasing .tdj( 6ux .gphmelting points?
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 bonding and ;rve rn 3ve+,dtherefore melting point, decreases down a group due to ie;3+ rev,r ndvncreasing atomic radius (more energy levels) and greater separation of the nuclei. Cs is 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.
| 
