D. I or Iodine
This is because they are both in the same periodic family (the halogens) and thus the number of valence electrons are the same
There are 0.000076 moles in 4.6 x 10^19 atoms.
<span>absorbed, radiated
Hope this helps. </span>
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Answer:

Explanation:
Hello,
In this case, we need to remember that for the required time for a radioactive nuclide as radium-226 to decrease to one half its initial amount we are talking about its half-life. Furthermore, the amount of remaining radioactive material as a function of the half-lives is computed as follows:

Therefore, for an initial amount of 100 mg with a half-life of 1590 years, after 1000 years, we have:

Best regards.