百度试题 结果1 题目3 How many neutrons are present in the atom $$ _ { 2 1 } ^ { 4 5 } $$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
百度试题 结果1 题目5 How many neutrons are present in the atom $$ _ { 2 1 } ^ { 4 5 } $$X? A 21 B 24 C 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
Neutrons are neutrally charged subatomic particles found in the nucleus of an atom along with the positively charged protons. Together, protons and neutrons contribute equally to the mass number of the atom. Answer and Explanation:1 Calculating the number of neutrons in the nucleus of an a...
The atom is the smallest representative unit of a single chemical element and it contains some numbers of protons, neutrons and electrons. The number of protons for an element is fixed and represented by its atomic number. The number of neutrons can vary, which is the basis for isotope...
Bailey Slaughter, who formerly worked on the UCNtau project while an undergraduate student at Indiana University, is seen here performing work inside the trap, or “bottle,” used to count the lifetime of neutrons. Credit: Chen-Yu Liu
百度试题 结果1 题目3 How many neutrons are present in the atom $$ _ { 2 1 } ^ { 4 5 } $$X? A 21 B 24 C 45 D 66 相关知识点: 试题来源: 解析 B 反馈 收藏
Fire a neutron at uranium-235 and you turn it into uranium-236: an unstable version of the same atom (a radioactive isotope of uranium) with 92 protons and 144 neutrons (remember that you fired an extra one in). Uranium-236 is too unstable to hang around for long so it splits apart...
In most cases, the number of electrons and protons are the same for an atom (making the atom neutral in charge). The neutrons are neutral. Their purpose in the nucleus is to bind protons together. Because the protons all have the same charge and would naturally repel one another, the ...
When an unstable atom disintegrates, it produces particulate radiation, including alpha and beta particles. For example, when radioactive elements like uranium, radium and polonium decay, they release radioactive alpha particles. These particles, made up of protons and neutrons, are large and can ...
Atomic number:The number of protons in an atom's nucleus is referred to as the atomic number of that element. The number of protons defines what element it is and determines its chemical behavior. For example,carbon atomsalways have six protons;hydrogen atomsalways have one; andoxygen atomsalw...