If you begin with 10g of a parent isotope, how much of the isotope will be left after one half-life?

after 1st half life the 10g of isotope will remain 5 g.

Explanation:

Given dа ta:

Mass of isotope = 10 g

Mass remain after one half life = ?

Solution:

At time zero = 10 g

AT 1st half life = 10 g/2 = 5 g

So after 1st half life the 10g of isotope will remain 5 g.