# What is half-life of radioactive elements?

## What is half-life of radioactive elements?

Half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay (change spontaneously into other nuclear species by emitting particles and energy), or, equivalently, the time interval required for the number of disintegrations per second of a radioactive …

**How do you find the half-life of a radioactive element?**

So, if a problem asks you to calculate an element’s half-life, it must provide information about the initial mass, the quantity left after radioactive decay, and the time it took that sample to reach its post-decay value. Therefore, its half-life is t1/2=98.012.7=7.72 years .

### How many half lives is 3?

Explanation: Three half lives corresponds to (12)3 . So a 18 quantity of the original isotope is retained.

**Which element has the longest half life?**

nvm problm solved: I finally found the element with longest half life, as stated in my element book,” Uranium is the last and heaviest of the natural elements” (203). “its half-life of 4.6 billion years makes it the longest-lived of all isotopes.

#### What element has half life?

Cesium-137 is a radioactive element with a half-life of thirty years. Its decay results in the formation of Ba-137 with a very short half-life. Both elements have the same atomic mass but cesium has an atomic number of 55 and barium has an atomic number of 56.

**What is the half life of radioactive material?**

The term half-life is defined as the time it takes for one-half of the atoms of a radioactive material to disintegrate. Half-lives for various radioisotopes can range from a few microseconds to billions of years.

## What is an example of a half life?

The half-life is the length of time that it takes for half of an initial sample to undergo a change. Usually this is the radio-active decay of a specific atomic weight of an element. For example, the half-life of Uranium-238 is 4.46 billion years.