First, it isn't very accurate to talk about a radioactive "element"; you should talk about radioactive isotopes. Different isotopes of the same element can have very different behavior in this sense. For example, hydrogen-1 and hydrogen-2 are stable, while hydrogen-3 is not (half-life about 19 years).
Individual atoms, in a radioactive isotope, will decay at a random moment. The half-life refers to how long it takes for half of the atoms in a given sample to decay (and convert to some other type of isotope).
The object with the smallest amount of original radioactive material X remaining is most likely the oldest. Over time, radioactive material decays at a consistent rate, so the object with the least remaining material has been decaying the longest.
The time it takes for half of a radioactive sample to decay is known as the half-life. Each radioactive element has a unique half-life, which could range from fractions of a second to billions of years. The half-life remains constant regardless of the size of the initial sample.
radioactive decay
No, graphite is not radioactive.
No, water is not radioactive.
many. one example is lead-214 with a halflife of 26.8 minutes.
halflife
my grandma
no, halflife is a constant for each isotope's decay process.
The basic idea is to compare the abundance of a naturally occurring radioactive isotope within a material to the abundance of its decay products; it is known how fast the radioactive isotope decays.
Uranium has the longest half-life element
Hydrogen has three isotopes: protium (1H), deuterium (2H), and tritium (3H). Protium is the most abundant and consists of one proton and one electron. Deuterium contains one proton, one neutron, and one electron. Tritium has one proton, two neutrons, and one electron.
Illadelph Halflife was created on 1996-09-24.
Half-life is the time it takes for one half of the radioactive material to decay. It is logarithmic, so after two half-lives, one quarter remains - then one eighth - etc.
No, halflife is a bulk statistical property of a quantity of an isotope of an element.Individual nuclei do not have halflives, instead they have a probability of decaying at the current moment of time.
Your question makes no sense.ordinary hydrogen has 1 proton and no neutronsdeuterium has 1 proton and 1 neutrontritium has 1 proton and 2 neutrons, it is radioactive with a halflife of about 12 yearsThere are more isotopes of hydrogen with more neutrons, but they are radioactive and have such short halflives that they are nearly undetectable.
One of the radioactive substances with the longest half-life is thorium-232, with a half-life of about 14 billion years. Another example is uranium-238, which has a half-life of about 4.5 billion years.