I assume you mean "half life". That means, how long does it take for half of the atoms in a sample to decay.
The half-life of the radioisotope Na-22 is 2.6 years.
The radioisotope with the shortest half-life among the following options is Polonium-214.
One-half of the original amount. That's precisely the definition of "half-life".
If a radioisotope undergoes six half-lives, only (1/64) or (0.015625) of the original radioisotope remains, because half of the remaining material decays at each half-life.
The length of time it takes for half of a radioactive sample to decay
It depends on the radioisotope. They do not all have the same half life.
The half-life of the radioisotope Na-22 is 2.6 years.
16 hours.
The radioisotope with the shortest half-life among the following options is Polonium-214.
One-half of the original amount. That's precisely the definition of "half-life".
How long it takes for half of a sample to decay to another form.
If a radioisotope undergoes six half-lives, only (1/64) or (0.015625) of the original radioisotope remains, because half of the remaining material decays at each half-life.
That would be "half-life". That means, how long does it take for half of the atoms in a sample to decay (convert into some other type of atom). Depending on the specific isotope, this "half-life" can be anything from a tiny fraction of a second, to billions of years.
It is 432 years.
It is 7,380 years.
It is 15.02 hours.
It is 14.6 years.