在化學元素是由方式的電子被安排在原子。這種安排是根據現代週期分類元素：週期表。
—from Structure and Bonding (Basic Concepts in Chemistry) (結構和成鍵（基本概念，化學）), a book by Jack Barrett
Active since December 4, 2009.
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| Rank | Username | WPM | Accuracy | Date |
|---|---|---|---|---|
| 277. | Yan (foolishman) | 26.07 | 42% | 2011-06-25 |
| 278. | kene Li (kene_lyk) | 25.95 | — | 2010-02-26 |
| 279. | Billy (icb003) | 25.91 | 51% | 2012-10-24 |
| 280. | Anastasia (wellwell) | 25.53 | 95% | 2015-09-26 |
| 281. | Iris (irism) | 25.38 | 35% | 2012-10-10 |
| 282. | tom (ff002) | 25.31 | 95% | 2012-03-28 |
| 283. | lorraine (lorrainew) | 25.23 | 86% | 2011-06-20 |
| 284. | iskei (iskeicheng) | 25.09 | 42% | 2013-02-08 |
| 285. | Tong (akttong) | 24.94 | 43% | 2011-05-09 |
| 286. | Jane (bbsslopon) | 24.82 | 47% | 2015-08-31 |
| 287. | Kit (kitleelee) | 23.84 | 68% | 2018-06-19 |
| 288. | Liu (jackliu2011) | 23.47 | 68% | 2011-11-05 |
| 289. | ng (cell_cell) | 23.30 | 36% | 2013-05-09 |
| 290. | 尻 (std14789) | 23.29 | 95% | 2015-12-25 |
| 291. | cyril (cyril200x) | 23.28 | 41% | 2012-09-14 |
| 292. | Coco (fanfan_) | 23.07 | — | 2010-11-21 |
| 293. | sa (sabowni) | 22.96 | — | 2010-08-17 |
| 294. | Milan (maggiemaggie) | 22.21 | 49% | 2013-01-12 |
| 295. | Rainy (rainyh) | 21.87 | 43% | 2013-01-21 |
| 296. | Lo (ballball0718) | 21.64 | — | 2010-12-04 |
| 297. | ypcat (ypcat) | 21.62 | — | 2011-01-28 |
| 298. | passion (passion) | 21.50 | 24% | 2013-04-06 |
| 299. | I want to type fast. (type_... | 19.78 | — | 2010-12-29 |
| 300. | Ka Yi (kayileung) | 18.13 | 30% | 2017-01-13 |
| 301. | Pien (aukaukau2000) | 17.66 | — | 2011-01-10 |
| 302. | Ｂｅｎｎｙ (bennyhk) | 15.65 | 68% | 2016-06-02 |
| 303. | Tom (cyberkamiry) | 15.62 | 45% | 2013-01-14 |
| 304. | 31陳雲騰 (ben224475590) | 10.82 | 66% | 2015-12-24 |
| 305. | 舜慈 (james66689) | 10.72 | 89% | 2015-12-24 |
| 306. | Sara (sarefo) | 9.42 | 39% | 2013-08-16 |
| Universe | Races | Average WPM | First Race |
|---|---|---|---|
| Traditional Chinese | 475 | 48.96 | December 4, 2009 |