While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide decays exponentially at a rate described by a parameter known as the half-life, usually given in units of years when discussing dating techniques.While the moment in time at which a particular nucleus decays is unpredictable, a collection of atoms of a radioactive nuclide

## How many years is a half-life?

A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay. For example, if the half-life of a 50.0 gram sample is 3 years, then in 3 years only 25 grams would remain. During the next 3 years, 12.5 grams would remain and so on.

## Which element has a half-life of only 8 seconds?

Meitneriums Meitneriums most stable isotope, meitnerium-278, has a half-life of about 8 seconds.

## What is the shortest lived element?

Hydrogen-7 ( about 23x10E-24) has the shortest half life.

## What element has a half-life of seconds?

Meitneriums most stable isotope, meitnerium-278, has a half-life of about 8 seconds.