Why are electrons, rather than protons, the principal charge carries in a metal wire? Why do electrons in insulators not contribute to its conductivity? Why do magnets attract or repel? Why is the tungsten filament in the electron gun folded?
题目5 Which statements comparing the properties of electrons, neutrons and protons are correct?B neutrons and protons are only electrons and both heavier than electrons neutrons are charged AB CD X 相关知识点: 试题来源: 解析 B 反馈 收藏
The electrons and protons themselves,however,are only crude first approximations,a way of collecting into a bundle either trains of waves or the statistical probabilities of various different kinds of events. 相关知识点: 试题来源: 解析 然而电子和质子仅仅是粗略的一次近似,这是一种将列波或者不同...
百度试题 结果1 题目Atoms are made from a nucleus of protons and neutrons and a cloud of electrons. A. 正确 B. 错误 相关知识点: 试题来源: 解析 正确 反馈 收藏
百度试题 结果1 题目Protons and neutrons are known as___ A) Electrons B) Neutrinos C) Nucleons D) Quarks 相关知识点: 试题来源: 解析 C 反馈 收藏
百度试题 结果1 题目Question. Thermions are B(a)protons(b)electrons(c)photons(d)positrons 相关知识点: 试题来源: 解析 B 反馈 收藏
An ion is an electrically charged species that differ in the number of electrons and protons. If the number of protons is more than electrons, a cation is formed which is positively charged. If the number of electrons is more than the number of protons, a negatively charged anion is...
百度试题 题目Atoms are made from even smaller particles. They are Protons, Neutrons and Electrons. A.正确B.错误相关知识点: 试题来源: 解析 A 反馈 收藏
In chemistry, the indication of the total number of protons present in the nucleus of one atom of a chemical element is usually done by their atomic number. The position of the chemical element in the periodic table is also represented by its atomic number...
Protons are subatomic particles that, along with neutrons, comprise the nucleus or central portion of an atom. The rest of the atom consists of electrons that orbit the nucleus, much as Earth orbits the sun. Protons can also exist outside an atom, in th