Question

The half-life of a radioisotope is the amount of time it takes for

Answer 1

half of the isotope to decay--half-life, half decayed, woo, intuitive.

Answer 2

the half life of an isotope is the amount of time it take for half of the isotope to decay.

Answer 3

Example. After half life a 100 g elements remains 50 g, after half life this element will remain 25 g, after half life again it will become 12.5 and so on....