1/5单选题
难度：
1.铜有两种天然同位素63Cu和65Cu，已知铜元素的近似相对原子质量为63.5，则63Cu的原子个数百分数是
| A | 75% |
| B | 25% |
| C | 50% |
| D | 45% |
- 提示1：
- 5YWD57Sg55qE6LSo6YeP5pWw562J5LqO5ZCE5qC457Sg55qE6LSo6YeP5LmY5Lul5a6D5Zyo6Ieq54S255WM5Lit5a2Y5Zyo55qE5q+U5L6L5LmL5ZKM44CC
正确答案：QQ==
6K6+PHN1cD42Mzwvc3VwPkN15Y6f5a2Q55qE5Y6f5a2Q5Liq5pWw55m+5YiG5q+U5Li6eO+8jOWImTxzdXA+NjU8L3N1cD5DdeeahOWOn+WtkOS4quaVsOeZvuWIhuavlOS4ujEteO+8jDxicj7pk5znmoTnm7jlr7nljp/lrZDotKjph4/kuLo2M++8jjXvvIzliJk2M3grNjXvvIgxLXjvvIk9NjPvvI4177yM6Kej5b6XeD03NSXvvIzpgIlB
2/5单选题
难度：
2.2008年由德、法、美及波兰等多国科学家组成的科研小组合成了非常罕见的
原子，有关的说法正确的是
原子，有关的说法正确的是 | A | 它是一种新元素 |
| B | 与 互为同位素 |
| C | 原子核外有19个电子 |
| D | 这种铁原子发生衰变放出两个质子后变成 |
- 提示1：
- 5Yik5pat5YWD57Sg55qE5qCH5YeG5pe26LSo5a2Q5pWw44CC
- 提示2：
- 6LSo5a2Q5pWw55u45ZCM6ICM5Lit5a2Q5pWw5LiN5ZCM55qE5YWD57Sg5LqS56ew5Li65ZCM5L2N57Sg44CC
正确答案：Qg==
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
3/5单选题
难度：
3.硼有两种天然同位素
、
，硼元素的近似相对原子质量为10.80，则对硼元素中的质量分数判断正确的是
、，硼元素的近似相对原子质量为10.80，则对硼元素中的质量分数判断正确的是 | A | 20% |
| B | 略大于20% |
| C | 略小于20% |
| D | 80% |
- 提示1：
- 5YWD57Sg55qE6LSo6YeP5pWw562J5LqO5ZCE5qC457Sg55qE6LSo6YeP5LmY5Lul5a6D5Zyo6Ieq54S255WM5Lit5a2Y5Zyo55qE5q+U5L6L5LmL5ZKM44CC
- 提示2：
- 5pys6aKY6KaB5rGC55qE5piv6LSo6YeP5YiG5pWw77yM6ZyA6KaB55So6K+l5YWD57Sg55qE6LSo6YeP6Zmk5Lul5YWD57Sg55qE5oC76LSo6YeP44CC
正确答案：Qw==
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
4/5单选题
难度：
4.氕化锂、氘化锂、氚化锂都可作为火箭的引燃剂．下列说法正确的是
| A | 1H、D+、T2互为同位素 |
| B | LiH、LiD、LiT含有的电子总数分别为3、4、5 |
| C | 7LiH、7LiD、7LiT的摩尔质量之比为1：1：1 |
| D | 一个D原子的质量约为 g |
- 提示1：
- 5ZCM5L2N57Sg5LiA5a6a5piv6ZKI5a+55YWD57Sg5p2l6K+055qE77yM5LiN6IO96ZKI5a+55b6u57KS77yM5aaC56a75a2Q44CB5YiG5a2Q562J44CC
- 提示2：
- 5rCV77yISO+8ieOAgeawmO+8iETvvInjgIHmsJrvvIhU77yJ5LiJ56eN5YWD57Sg55qE6LSo6YeP5pWw5YiG5Yir5Li677yaMeOAgTLjgIEz44CC
正确答案：RA==
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
5/5单选题
难度：
5.哈雷彗星上碳的两种同位素12C和13C的原子个数比为65：1．而地球上12C和13C的原子个数比为89：1，地球上碳元素的原子相对质量是12.011，那么哈雷彗星上碳元素的原子相对质量是
| A | 12.000 |
| B | 12.009 |
| C | 12.015 |
| D | 12.980 |
- 提示1：
- 5YWD57Sg55qE6LSo6YeP5pWw562J5LqO5ZCE5qC457Sg55qE6LSo6YeP5LmY5Lul5a6D5Zyo6Ieq54S255WM5Lit5a2Y5Zyo55qE5q+U5L6L5LmL5ZKM44CC
正确答案：Qw==
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