The nucleus of an atom as composed of swiftly moving protons and neutrons that are ___ together by very strong forces. A. 国极型形况需油住车已国极型形况需油住车已combined国极型形况需油住车已国极型形况需油住车已 B. 种说种说mixed种说种说 C. 如等王达少例节每但华发如等王达少例节...
Visible matter consists of atoms, and at the centre of atoms are protons and neutrons. But even these aren’t elementary particles, as detailed by the current “standard model” of particle physics, our leading description of reality on the tiniest scales. So we begin, deep down...
百度试题 结果1 题目3 How many neutrons are present in the atom ? B A 21 B 24 C 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
Describe the structure of an atom.An atom consists of a nucleus, which contains protons and neutrons, surrounded by electrons. Protons have a positive charge, neutrons have no charge, and electrons have a negative charge. The number of protons determines
百度试题 结果1 题目5 How many neutrons are present in the atom X? B A 21 B 24 C 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
At the same time, two or three free neutrons are released and one of them enters the nucleus of a neighbouring atom, causing fission to occur again; and so on. The reaction spreads very quickly, with more and more heat energy released. This is called a "chain" reaction because the ...
题目 3 The diagram shows only the protons and electrons in an atom of Boron. The neutrons are not shown.Key Electron+4 Proton With the help of the Periodic Table, how many neutrons are there in the nucleus of this atom?B A5B6C10D11 相关知识点: 试题来源: 解析 B 反馈 收藏 ...
The nucleus of an atom is composed of neutrons and protons. 原子核由中子和质子两种微粒构成。 Around this nucleus swirls a cloud of electrons. 在原子核外部,电子云围绕原子核旋转。 Why are theelectrons there? 为什么这里会有电子呢? They are attracted and held in place by an electromagnetic ...
An electrically neutral subatomic particle that is part of the nucleus of an atom and has a mass slightly greater than that of a proton. Beams of neutrons from nuclear reactors are used to bombard the atoms of various elements to produce fission and other nuclear reactions and to determine the...
25 Which of the following statements about atoms and ions is correct? C A The nucleon number of an element is the number of neutrons. B The number of neutrons and electrons are the same in an atom. C An atom with atomic number of 5 will lose 3 electrons to form a positive ion. D...