Question

A particular isotope has a half-life of 10 minutes. if we start with 2,000 atoms, in a half-hour, we will have how many atoms left

Answer 1

Hello friend
Half life is defined as the time during which 50% of the reaction gets completed is said to be half life period or half life time of that reaction.
or
the time during which initial concentration of reactant is just reduced to 50% is called half
life peroliod .


thus according to question after ten minutes the no. of atoms left will be 1000 .