List of elements by stability of isotopes

（重定向自Stable element）

Isotope half-lives. Note that the darker more stable isotope region departs from the line of protons (Z) = neutrons (N), as the element number Z becomes larger

Periodic table colored according to the number of stable isotopes. Elements with odd atomic numbers have at most one or two stable isotopes, while elements up to lead with even atomic numbers all have three or more stable isotopes, except for the first three: helium, beryllium, and carbon.

Periodic table with elements colored according to the half-life of their most stable isotope.
  Stable elements: Elements which contain at least one stable isotope;
  Slightly radioactive elements: the most stable isotope is very long-lived, with half-life of over two million years;
  Moderately radioactive elements: the most stable isotope has half-life between 800 and 34,000 years;
  Highly radioactive elements: the most stable isotope has half-life between one day and 103 years;
  Significantly radioactive elements: the most stable isotope has half-life between one minute and one day;
  Extremely radioactive elements: the most stable isotope has half-life less than a minute. Very little is known about these elements due to their extreme instability and radioactivity.

This is a list of the chemical elements and their isotopes, listed in terms of stability.

Atomic nuclei consist of protons and neutrons, which attract each other through the nuclear force, while protons repel each other via the electric force due to their positive charge. These two forces compete, leading to some combinations of neutrons and protons being more stable than others. Neutrons stabilize the nucleus, because they attract protons, which helps offset the electrical repulsion between protons. As a result, as the number of protons increases, an increasing ratio of neutrons to protons is needed to form a stable nucleus; if too many or too few neutrons are present with regard to the optimum ratio, the nucleus becomes unstable and subject to certain types of nuclear decay. Unstable isotopes decay through various radioactive decay pathways, most commonly alpha decay, beta decay, or electron capture. Many other rare types of decay, such as spontaneous fission or cluster decay are known. (See radioactive decay for details.)

单词	Stable element
释义	Stable element 原声例句 TED-Ed（视频版） The radioactive fission products in these vapors eventually decay into stable elements. 这些蒸汽中的放射性裂变物质会最终衰退成稳定元素。生活大爆炸第7季 Sheldon, did you just figure out a method for synthesizing a new stable super-heavy element? 谢尔顿，难道你刚刚是想出了合成新型稳定超重元素的方法了? 生活大爆炸第7季 This is Science Friday. I'm Ira Flatow. My guest today is responsible for the discovery of the first stable super-heavy element. 这是科学星期五，我是艾拉·弗莱托，我们今天的嘉宾是发现首个稳定超重元素的科学家。 Veritasium 真理元素 Iron is the most stable element. 铁是最稳定的元素所以它。英语百科 List of elements by stability of isotopes （重定向自Stable element） This is a list of the chemical elements and their isotopes, listed in terms of stability. Atomic nuclei consist of protons and neutrons, which attract each other through the nuclear force, while protons repel each other via the electric force due to their positive charge. These two forces compete, leading to some combinations of neutrons and protons being more stable than others. Neutrons stabilize the nucleus, because they attract protons, which helps offset the electrical repulsion between protons. As a result, as the number of protons increases, an increasing ratio of neutrons to protons is needed to form a stable nucleus; if too many or too few neutrons are present with regard to the optimum ratio, the nucleus becomes unstable and subject to certain types of nuclear decay. Unstable isotopes decay through various radioactive decay pathways, most commonly alpha decay, beta decay, or electron capture. Many other rare types of decay, such as spontaneous fission or cluster decay are known. (See radioactive decay for details.)
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