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.
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.
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.
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.
No, gold has only one naturally occurring isotope and it is non-radioactive.
1939K is stable and non-radioactive. It, therefore, has no half-life.
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.