78.1. THE PERIODIC TABLE 元素周期表 (图片可点击放大) In this section, we will explore the periodic table, which organizes chemical elements and provides valuable information about their properties and relationships. Understanding the periodic...
第17族:卤族元素(Halogens);卤族元素:氟,氯,溴,碘,砹,“石田” / F, Cl, Br, I, At 第18族:稀有气体(Noble Gases);稀有气体:氦,氖,氩,氪,氙,氡,“气奥” / He, Ne, Ar, Kr, Xe, Rn, Og 澜系元素(Lanthanoids): La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, ...
More so than any of the other major groups of elements in the periodic table, the transition metals have shaped human history and have been the workhorses of industry. The discovery of metallic copper ended the Stone Age and ushered...
Inert gases, better known as noble gases, are characterized by their high chemical stability, so that they can exist in nature as monoatomic gases and, under normal conditions, meet the equation of state of ideal gases.Answer and Explanation: The periodic table of chemical elements ...
After its appearance, the table was confronted with several problems, including the accommodation of the noble gases, allowance for the existence of elemental isotopes, and the placement of the lanthanide and actinide elements. In spite of many such challenges, the periodic table has stood the ...
maingroupelements（主族元素）transitionelements（过渡元素）Noblegases/inertgas(稀有气体/惰性气体) s/p/d/fblock(s、p、d、f区)Periodictableofelements Non-metal:非金属Metalloid:准金属Metal:金属 alkalimetal（碱金属）['ælkə'lai]Metal alkalineearthmetal（碱土金属）['ælkə'...
Noble gases are monatomic, they exist as single atoms. Neon is used for neon signs, helium is used in balloons, argon is used in 3D printing, welding, lasers and has lots of other manufacturing uses. Radioactive Elements Many of the elements at the bottom of the table ( in green ) are...
Noble Gases on the Periodic Table | Group 8A Elements from Chapter 7 / Lesson 9 84K In this lesson: understand what the noble gas elements are, where they are found on the periodic table, and why the noble gases are stable. Related...
the oxygen family, is technically called the "chalcogens." Group VII, the"halogens,"begins with fluorine. Finally, the elements of Group VIII, starting with helium, are called the"noble gases."Because of their relative unreactivity, they had once also been termedinertgases, a label no longe...
Chemically, helium behaves as a noble gas, and thus is taken to be part of the group 18 elements. However, in terms of its nuclear structure it belongs to the s block, and is therefore sometimes classified as a group 2 element, or simultaneously both 2 and 18. Hydrogen readily loses ...