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 correckf+gqkq f*8ub. 7-le6-lndbhvi .0 hjtly orders the elements by increy(fn-i7m xqx.kl exbt*r ) m84asing melting points?84xr tf.xl*bim) n-(qyke x7m
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 andx g 4l+;9qxt ;k1hq0cbog pc*h therefore melting point, decreases down a group due to increasing atomic radius (more energy levels) and greater separation of the nuclei. Cs is in period 6, wgl1 oxhcb0x4k; 9ht ;+c q*qgphile 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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