1. What is the name for the horizontal rows of the periodic table? B A. groups B. periods C. families D. sets 相关知识点: 试题来源: 解析B1. B: The horizontal rows of the periodic table are called periods. The vertical columns of the periodic table are known as groups or families....
A. Groups B. Periods C. Elements D. Properties 相关知识点: 试题来源: 解析 B。原因:文章中明确提到“The horizontal rows or periods show how the properties of elements change as you move across.”,即水平行被称为 periods。反馈 收藏
Question: From the periodic table, what is the atomic number of aluminum? (a) 26.98 (b) 13 (c) 18 (d) 39.95 Elements: Elements are pure substances composed of only one type of atoms. They can exist in multiple isotopic forms which can vary in the number of neutron...
aTransfer Students – you may make an appointment with Kelly MacArthur in the Math Department to see if your former university’s math course will fulfill the math requirement here at the University of Utah. 调动学生-您在算术部门可以定一次约会与凯利MacArthur看您的前大学的算术路线是否这里将履行算...
What is tin on the periodic table?Periodic table:There are 118 known elements that are organized on the periodic table. The periodic table was developed by a Russian scientist named Dmitri Mendeleev. The elements are organized by the number of protons in their nucleus, called the atomic number...
百科挑战题1) What is the letter forprop in the periodic table of chemical elements(化学素周期)? A.Fe B.Zn C.Ha2) What is the best way to look up information on the interne? A. By using e-mail B. By using QQ B33) What is the material of pengl leag()? A.lime B. graphite(...
A. All elements are solids. B. Elements in different periods have no similarities. C. The periodic table helps us understand the relationships between elements. D. The periodic table only shows the names of E. lements. 相关知识点: 试题...
The Periodic Table is a table of all the elements we know about today. Elements are placed in order of atomic number ( number of protons in the nucleus ).
The first and most important principle is that chemical substances are made up of molecular in which atoms of various elements are linked in well-defined way. The second principle is that there are somewhat more than 100 elements, which are listed in the periodic table of the elements. The ...
What is the group number in the periodic table of X, a representative element, in each of the following ionic compounds. 1. X2O3 2. X2SO3 3. Na3X Representative elements: Representative elements involve the filling of s an...