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. Developed by Dmitri Mendeleev to organize the known elements acco
although it now showed a small number of elements to be out of order by atomic weight. The version of the periodic table of the elements developed by Mosely is the
The modern periodic table is slightly different to the one created by Mendeleev as it is ordered by atomic number, not atomic mass. Chemical symbols that don’t look like their name Each element has a chemical symbol that is the same in every language. Some are obvious, such as Li for L...
结果1 题目 8 What determines the order of elements in the Periodic Table? A first ionisation energy B number of electrons in the outer shell C number of protons in the nucleus D relative atomic mass Your answer C 相关知识点: 试题来源: 解析 C 反馈 收藏 ...
Although it has been suggested that the notion of element as basic substance should be considered in terms of fundamental particles like protons and electrons, I resist this move and conclude that the quantum mechanical tradition has not had much impact on the question of what is an element ...
The periodic table is a table in which elements are arranged in increasing atomic number (which is the number of protons an atom of the element has)... Learn more about this topic: Periodic Table Groups vs. Periods | Properties & History from...
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...
The atomic weights of the elements D. The sizes of the E. lements 相关知识点: 试题来源: 解析 C。解析:文中提到“Mendeleev was a Russian chemist who in 1869 proposed a periodic table based on the atomic weights of the elements.”,所以答案是 C。反馈 收藏 ...
Are you confused by all the numbers on aperiodic table? Here's a look at what they mean and where to find important elements. Element Atomic Number One number you will find on all periodic tables is theatomic numberfor eachelement. This is the number of protons in the element, which defi...
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