Sodium is in the first representative group. An atom of sodium has ... valence electrons What characteristic distinguishes an element from a compound? Referring only to a periodic table, give the number of covalent bonds expected for each of these representative elements: (a) H (b) Ar (c)...
What is the atomic mass/weight of an atom that has 24 protons, 26 neutrons, and 24 electrons? What is the mass number of the hydrogen isotope that contains 2 neutrons? An atom has 20 electrons and 20 neutrons. What is the mass of this atom? A single atom of an eleme...
百度试题 结果1 题目6 An atom of element Q contains 19 electrons, 19 protons and 20 neutrons.What is Q?B A calcium B. potassium c strontium D. yttrium 相关知识点: 试题来源: 解析 B 反馈 收藏
An N-type semiconductor is one that carries current in the form of negatively-charged electrons. This is very similar to conduction of current in a wire. A P-type semiconductor is one that carries current predominantly as electron deficiencies called holes. A hole has a positive electric charge...
An element is defined by the number of protons in its nucleus, so this process transforms iron into heavier elements, like gold, in what is almost a form of cosmic alchemy. It is theradiation from the decay of the radioactive elementscreated during the r-process that makes the material eje...
Valence electrons are those electrons that reside in the outermost shell surrounding an atomic nucleus. Valence electrons are of crucial importance because they lend deep insight into an element’s chemical properties: whether it is electronegative or electropositive in nature, or they indicate theb...
To determine the number of valence electrons in the atom of an element A with atomic number 20 and to identify its valence shell, follow these steps:Step 1: Write the Electronic Configuration The atomic number of element A is 2
A third method of making alloys is to fire beams of ions (atoms with too few or too many electrons) into the surface layer of a piece of metal. Ion implantation, as this is known, is a very precise way of making an alloy. It's probably best known as a way of making the ...
1-Electron configuration for Cl^{-} 2- What is the atomic symbol for the noble gas that also has this electron configuration? An ion from a given element has 11 protons and 10 electrons. What is the charge on the ion? What is th...
Which element has a complete valence electron shell? What are the electrons in the outermost shell of an atom called? What chemical element has 35 protons and 36 electrons? What is the chemical element antimony? What is between metals and nonmetals on the periodic table?