Question

If an isotope of some element has a half of 300 years about how much of the isotope will be in sample after 300 years

Answer 1

A half-life is how long an isotope takes to break down. A 300 year half life means that half of the sample will be left after 300 years.

Answer 2

If the half life is 300 years, after 300 year The mass of the sample will be half of whatever the initial mass of the substance was