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, whlix;fr6h9of , ich series correctm- 27 hnif ,oee6ybev;*rd) crly orders the elements by increasing melting-; i6oyec, hbr*vn m) dr2ee7f 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 therefore melting point,*9 b-isl rk; dunhk;p7 decreases down a group due to increasing atomic radius (more energy levels) and greater separation of the nuclei.lhd;n*br9 pk;7suk - i 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.
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