补全短文-第三篇重新发明元素周期表
第三篇Reinventing〔发明、创造〕 the Table
An earth scientist has rejigged〔更改、重新安排〕the periodic〔周期的〕 table to make chemistry simpler to teach to students.
But Bruce Railsback from the University of Georgia says he is the first to create a table that breaks with tradition〔传统、惯例〕and shows the ions〔离子〕of each elements rather than just the elements themselves.
students,
He has also included symbols(符号、标记) to show which ions are nutrients(营养物) , and which are common in soil or water. And the size of element' s
练习:
A There have been many attempts〔尝试、试图〕 to redesign the periodic table since Dmitri Mendeleev drew it up in l87l.
B Railsback has still ordered the elements according to the number of protons〔质子〕 they have.
C
D Railsback has listed some elements more than once.
E And the size of element' s symbol reflects how much of it is found in the Earth’s crust〔外壳〕.
F The traditional periodic table was well drawn.
第三篇重新发明元素周期表
一位地学科学家已经调整了元素周期表,使得教学生化学时更容易些。 自从l87l年门捷列夫画出元素周期表以来,许多人试图重新设计周期表。但是佐治亚大学的Bruce Railsback说他第一个创造性地制作了一个表,这个表突破了传统,显示了每个元素的离子而不只是元素本身。
“在给地学学生解释元素周期表时我的手臂都要累坏了,”他说到这时在空中来回移动他的两只手,指点传统周期表中不同的元素。Railsback仍然按照元素所有的质子数排列元素。但是他加入了等高线来指示密度,帮助解释哪些离子和哪些离子起反应。
剑桥大学的Albert Galy说“地球化学家们只想通过直觉判断元素的活动。我想等高线对大学生们有好处。”
Railsback对某些元素不止列出了一次。他解释说,以硫酸为例,它出现在了三个不同的位置上——一个是硫化物,存在于矿物中;一个是亚硫酸盐;另一个是硫酸盐,存在于海盐等物质中。
他还纳入了符号表示哪些离子是有营养的,哪些是土壤和水中普遍存在的。元素符号的大小反映出它在地壳中被发现的量。