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 rcxw1rjsdx6z : 4mmq:8egard0 dbue w0wlxie gb5,,3e6jjl 4ing the periodic table are correct?
I. Anions have larger ionic radii than the atomic radius of their parent atom
II. Elements in the periodic table are arranged according to their number of protons
III. Elements within the same period will have similar physical properties
A. $I$, $II$, and $III$
B. $I$ and $II$ only
C. $I$ and $III$ only
D. $II$ and $III$ only
参考答案: B
本题详细解析:
Explanation: Statement III is not correct as physical properties, including melting point and metallic character, change dramatically across a period due to changes in nuclear charge for the same number of shells.
Elements in the periodic table are arranged in increased atomic number.
Anions are atoms that have gained electrons. This will increase the electron-electron repulsion in the outermost shell, and will cause the electrons to move further apart.Therefore, the radius of the outershell will increase.
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