After one half-life, ____________________ of the radioactive ...

[gonzo233]

After one half-life, ___________________ _ of the radioactive parent atoms will have decayed to
  stable daughter atoms. Fill in the blank(s) with the appropriate word(s).

Question 2

The time necessary for half of the atoms of the unstable parent element to decay to the new, more
  stable daughter element is the isotope's ___________________ _. Fill in the blank(s) with the appropriate word(s).

[recede]

Answer to Question 1

50

Answer to Question 2

half-life

[gonzo233]

Thanks for the timely response, appreciate it

[amit]

Excellent