If you have 8 g of a radioactive element there will be Of the radioactive element left after one half life

4g of the radioactive element present

Explanation:

Radioactive elements are atoms that are unstable in normal conditions and are converted in another different atoms.

1 half life express the time that is need to decay the half of the initial amount of the radioactive element.

If initially we have 8g of the radioactive element, after 1 life we will have 8g/2 =

4g of the radioactive element present

answer7,570,82356 cubic centimeters;

c. 4.54 x 10–12 j happens to be correct