问题
选择题
Eric the Red was forced to leave because he had committed a murder, ____ he got into trouble.
A．for which
B．where
C．to which
D．why
答案
答案：A
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Eric the Red was forced to leave because he had committed a murder, ____ he got into trouble.
A．for which
B．where
C．to which
D．why
答案：A
下表是元素周期表的一部分：
| 族 周期 | ⅠA | 0 | ||||||
| 一 | 1 H 1.008 | ⅡA | ⅢA | ⅣA | V A | ⅥA | ⅦA | 2 He 4.003 |
| 二 | 3 Li 6.941 | 4 Be 9.012 | 5 B 10.8l | 6 C 12.01 | 7 N 14.0l | 8 O 16.00 | 9 F 19.00 | 10 Ne 20.18 |
| 三 | 11 Na 22.99 | 12 Mg 24.31 | 13 Al 26.98 | 14 Si 28.09 | 15 P 30.97 | 16 S 32.06 | 17 Cl 35.45 | 18 Ar 39.95 |
（2）相对原子质量为22.99的元素属______（填“金属”或“非金属”）；Ne的化学性质______；F元素最外层电子数为______．
（3）表中不同种元素最本质的区别是______（填字母）．
A．质子数不同B．相对原子质量不同C．中子数不同
（4）
为某元素的原子结构示意图，该元素位于周期表中第______周期．