Q: What is the half life of the Radioisotope Na22?

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One-half of the original amount. That's precisely the definition of "half-life".

I assume you mean "half life". That means, how long does it take for half of the atoms in a sample to decay.

The length of time it takes for half of a radioactive sample to decay

It is 100 years.

The half-life is 16 hours.

Related questions

It depends on the radioisotope. They do not all have the same half life.

It is 432 years.

It is 15.02 hours.

It is 14.6 years.

It is 300,000 years.

It is 5.27 years.

It is 18.11 years.

It is 14.1 hours.

It is 11.2 years.

It is 252 days.

It is 12.33 years.

It is 7,380 years.