No, it does not. The longest lived isotope, plutonium-244, has a half life of 80,800,000 years.
All the isotopes of promethium are radioactive.
Isotopes do not stop decaying. The process of radioactive decay continues until the isotope reaches a stable state, which could be a different isotope or a non-radioactive element. The rate of decay can vary depending on the specific isotope.
Thulium is a non-radioactive element. It is part of the lanthanide series on the periodic table and has no stable isotopes that are radioactive. Thulium-169, the most common isotope, is stable and does not undergo radioactive decay. Therefore, thulium is considered non-radioactive.
No it does not. There are various types (isotopes) of plutonium. Plutonium 238, the weapons grade material, has a half life of 88 years. Meaning after 88 years half of the material has transforms into another element through radioactive decay. Plutonium-240 has a half life of ~80 Million years. But eventually all types of plutonium will decay into other elements. All radioactive elements will eventually decay into non-radioactive atoms given enough time.
Carbon is non-radioactive excepting the isotope carbon-14.
Radioactive minerals are unstable and emit radiation at a constant rate. They also have half lives and lose energy overtime. Nonradioactive minerals are stable, and by there own are incapable of emitting energy.
If you had a stable element 115, then by definition there would need to be at least one non-radioactive isotope. Stable elements are those that have at least one nonradioactive isotope. Of course, the other isotopes of the element could all be radioactive.
1939K is stable and non-radioactive. It, therefore, has no half-life.
No, gold has only one naturally occurring isotope and it is non-radioactive.
Plutonium is a non-renewable resource. It is a radioactive element that is primarily produced through the nuclear fission of uranium-238 in nuclear reactors. Once plutonium is used in nuclear reactions, it undergoes a series of radioactive decays and eventually becomes unusable for energy production. Due to the limited availability of uranium-238 and the complex process required to produce plutonium, it is considered a finite and non-renewable resource.
For practical purposes, platinum can be regarded as not radioactive. Of naturally occurring platinum, 99.886% is considered stable, and the one radioactive isotope 190Pt, has a half life 650,000,000,000 years. Like all elements, platinum has synthetic radioactive isotopes.
Only the end product of the decay chain of uranium, a non radioactive isotope of lead.