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
百度试题 结果1 题目What is a row of elements on the periodic table called? A. octave B. period C. group D. transition 相关知识点: 试题来源: 解析 B 反馈 收藏
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...
解析 Ans. The d block elements are in the middle of S and p blocks, comprising the groups 3to 12.They are the four rows of elements in the periods 4h (3d series), 5th (4d series), 6th ( 5d series)and 7h ( 6d series).
This discussion has focused on the writings of Fritz Paneth which are here analyzed from a new perspective. The other tradition concerns the reduction of chemistry to quantum mechanics and an understanding of chemical elements through their microscopic components such as protons, neutrons and electrons...
ainitializing the operation 初始化操作[translate] 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...
What is an inert gas on the periodic table? What element family does bohrium belong to on the periodic table? What is Na on the periodic table? What is tin on the periodic table? What is between metals and nonmetals on the periodic table? What are elements in groups 3 through 12 on ...
are called periods. The period number of an element signifies the highest energy level an electron in that element occupies (in the unexcited state). The number of elements in a period increases as one traverses down the periodic table because as the energy level of the atom increases, the ...
Two other metallic elements are less dense than water.Potassiumhas a density of 0.862 g/cm3whilesodiumhas a density of 0.971 g/cm3. All of the other metals on the periodic table aredenserthan water. While lithium, potassium, and sodium are all light enough to float on water, they are als...
1. Understanding the Periodic Table: The periodic table is a systematic arrangement of elements based on their atomic number, electron configuration, and recurring chemical properties. 2. Classification into Periods and Groups: The elements are organized into horizontal rows called periods and vertical ...